Jurnal IT

Komputasi dan Pengetahuan Umum

Petunjuk Pemakaian Module Purchases



In the preceding chapters you saw how to use customer invoices and delivery notes in OpenERP. This chapter is about the management of purchases, the process ahead of these two operations. You will now see how OpenERP handles and simplifies this and the control of purchases from suppliers.


For this chapter you should start with a fresh database that includes demonstration data, with purchase and its dependencies installed and no particular chart of accounts configured.


All the Elements of a Complete Workflow

The supplier order is the document that lets you manage price negotiations, control supplier invoices, handle goods receipts and synchronize all of these documents.


Start by looking at the following order workflow:

  1. Price request to the supplier,
  2. Confirmation of purchase,
  3. Receipt and control of products,
  4. Control of invoicing


Price Request from the Supplier

To enter data for a new supplier price request, use the menu PurchasesàPurchase Management! à
Request for Quotation.


On clicking New, OpenERP opens a blank request for quotation form that you use for requesting

prices from a supplier. This is shown in the figure Data entry for a supplier order. If the price request came from an automatic procurement created by OpenERP, you will find a reference to the document that generated the request in the Origin field.


Figure 23.1: Data entry for a supplier order


Managing Alerts

If you install the warning module, you will be able to define alerts that appear when the purchaser enters a price request or order. You can set alerts on the product and on the supplier


The internal reference, the date, and the warehouse that the products should be delivered to are completed automatically by OpenERP but you can change these values if you need. Next, when you select a supplier, OpenERP automatically completes the contact address for the supplier. The pricelist is also automatically completed. This should bring in all of the conditions that you have negotiated with the supplier for a given period.


Tip: Supplier Selection

Searching for a supplier is limited to all of the partners in the system that have the Supplier checkbox checked. If you do not find your supplier, it might be worth checking the whole list of all partners to make sure that the supplier has not been partially entered into the system.


Once the main body of the purchase order has been completed, you can enter the product lines.

Figure 23.2: Order line on a supplier order



When you have selected the product, OpenERP automatically completes the other fields on the form:

  • Product UoM, taken from the Purchase Unit of Measure field on the product form,
  • The Description of the product in the supplier’s language,
  • Scheduled Date, calculated from the order date and the lead time

  • Unit Price, provided by the supplier pricelist,

  • Taxes, taken from the information on the product form and partner form, depending on the rules seen in
  • Financial Analysis.



Tip: Product wording and code

When you enter supplier names on the product form, you can set a name and a product code for each individual supplier. If you do that, OpenERP will then use those details in place of your own internal product names for that selected supplier.



If you work with management by case, you can also set the analytic account that

should be used to report all the purchase costs. The costs will then be reported at the receipt of the supplier invoice.


Tip: Management by Case

Analytic accounts can be very useful for all companies that manage costs by case, by site, by project or by folder. To work with several analytic axes, you should install the module purchase_analytic_plans, by selecting Purchase Analytic Plans in the Reconfigure wizard and clicking Configure.


So that the analytic account is automatically selected as a function of the partner, the date, the products or the user, you can install the module account_analytic_default
(which is installed automatically as a

dependency of purchase_analytic_plans, since the latter depends on it).


In the Notes tab of the product line, you can enter a note that will be attached when the order confirmation or price quotation is printed. This note can be predefined on the product form to automatically appear on each order for that product. For example, you can enter “Do not forget to send by express delivery as specified in our contract reference 1234.”


Once the document has been completed, you can print it as a price estimate to send to the supplier. You can set a note for the attention of the supplier in the form’s third tab.



Figure 23.3Contoh hasil print – out supplier price quotation


Then leave the document in the Request for Quotation state. When you receive a response from the

supplier, use the menu PurchasesàPurchase ManagementàRequests for Quotation.

Select the order and complete its details.

When you want to approve the order, use the button Convert to Purchase Order. The price request then passes into the Approved state. No further changes are possible.


Berikut adalah bagan atau alur kerja proses Purchasing dalam system ERP ini :

Figure 23.4: Supplier order process



Goods Receipt/Penerimaan Barang


Once the order has been approved, OpenERP automatically prepares the goods receipt order in the draft state for you. To get a list of the products you are waiting for from your suppliers, use the menu Warehouse—–>Warehouse Management—–> Incoming Shipments.


Tip: Purchasing Services

If you buy services from your supplier, OpenERP does not generate a goods receipt note. There is no service receipt equivalent to a goods receipt.


Select the document that corresponds to the item that you are receiving. Usually, the goods receipt note is found by making a search on the order reference or the supplier name. You can then confirm the receipt of the products.


As you saw in Your Warehouse, if you receive only part of the order, OpenERP manages the remainder of that order. A second receipt note is then automatically created for the goods not received. You can cancel it if you think that you will never receive the remaining products.


After receiving the goods, OpenERP will show you which orders are open and the state of their receipt and invoicing if you return to the list of orders.

Figure 23.5: List of open orders, and their receipt and invoice status



23.1.4 Control of Invoicing


To control supplier invoicing, OpenERP provides three systems as standard, which can differ order by order:

  • From Order : invoicing based on quantities ordered,
  • From Picking : invoicing based on quantities received,
  • Manual : manual invoicing.

Figure 23.6: Supplier order, invoice control



Tip: Default Value

A company generally uses a single invoicing control method for all of its invoices. So you are advised to set a default value in the Invoicing Control field after installation.


23.1.5 Control based on Orders


If you selected your invoicing control based on orders, OpenERP will automatically generate a supplier invoice in the draft state when the order is confirmed. You can obtain a list of invoices waiting using the menu Accounting—>Suppliers —->Supplier Invoices and enabling the Draft


When you receive a paper invoice from your supplier, all you need to do is validate the invoice pre- generated by the system. Do not forget to check the price and the quantities. When the invoice is confirmed, the accounting entries represent the cost of purchase and are automatically entered into the system.


The supplier order is then automatically set as Paid when you pay the supplier invoice.

This method of controlling invoices is often used in service companies, because the invoiced amounts correspond

to the ordered amounts. In logistics, by contrast, you most often work with invoicing controlled by goods receipt.



23.1.6 Control based on Goods Receipt


To control your supplier invoices based on goods receipt, set the field Invoicing Control on the second tab of the order to From Picking.

In this case, no invoice, draft state or any other, is generated by the order. On the goods receipt note, the field Invoice Control is set to To Be Invoiced.


The storesperson can then receive different orders. If he wants to generate the draft invoice for a goods receipt, he can click the action Create Invoice. OpenERP then asks you for the journal for this invoice. It then opens that or the generated invoices (in the case of creating invoices for several receipts at one time) which enables you to modify it before confirming it.


This approach is useful when you receive the invoice at the same time as the item from the supplier. Usually, invoices are sent by post some days later. In this case, the stores person leaves the item unchanged without generating an invoice. Then, once per day or once per week the accountant will create the draft invoices based on all the receipts for the day.


To do that, he uses the menu Purchases –à Invoice Control —> Purchase Lines Not Invoiced.


He clicks on the action Create invoices to generate all draft invoices from the list of receipts that have not yet been invoiced. At that point, the accountant can decide if he wants to generate an invoice per item or group all items for the same partner into the same invoice.


Invoices are then handled just like those controlled from On Order. Once the invoice arrives at the accounting service, he just compares it with the invoices waiting to control what the supplier invoices you.




Tip: Delivery Charges

To manage delivery charges, install the module delivery using the Reconfigure wizard and selecting Delivery Costs in Sales Application Configuration section. This will automatically add delivery charges to the creation of the draft invoice as a function of the products delivered or ordered.



23.1.7 Tenders (Pengajuan/Usulan Pembelian)


To manage tenders, you should use the module purchase_requisition, installed via the Purchase

Requisition option in the Reconfigure wizard. This lets you create several supplier price requests for a single supply requirement. Once the module is installed, OpenERP adds a new Purchase Requisitions
menu in Purchases —->
Purchase Management
. You can then define the new tenders.

Figure 23.7: Defining a tender


To enter data for a new tender, use the menu Purchases à
Purchase Management ——>
Purchase Requisitions
and select New. OpenERP then opens a new blank tender form. The reference number is set by default and you can enter information about your tender in the other fields.


If you want to enter a supplier’s response to your tender request, add a new draft purchase order into the list on the Quotation tab of your tender document. If you want to revise a supplier price in response to negotiations, edit any appropriate purchase order that you have left in the draft state and link that to the tender.


When one of the orders about a tender is confirmed, all of the other orders are automatically cancelled by

OpenERP. That enables you to accept just one order for a particular tender.


23.1.8 Price Revisions (Perubahan Harga)

OpenERP supports several methods of calculating and automatically updating product costs:

  • Standard Price: manually fixed, and
  • Standard Price: revalued automatically and periodically,
  • Average Price: updated at each receipt to the warehouse.

This cost is used to value your stock and represents your product costs. Included in that cost is everything directly related to the received cost. You could include such elements as:

  • supplier price,
  • delivery charges,
  • manufacturing costs,
  • storage charges.

Standard Price (Harga Standar)

The mode of price management for the product is shown in the tab Information on the product form. On each individual product, you can select if you want to work in Standard Price
or on weighted Average




Tip: Simplified Interface

If you work in the Simplified interface mode you will not see the field that lets you manage the price calculation mode for a product. In that case, the default value is Standard Price.



The Standard Price
setting means that the product cost is fixed manually for each product in the field Cost Price. This is usually revalued once a year based on the average of purchase costs or manufacturing costs.


You usually use standard costs to manage products where the price hardly changes over the course of the year.


For example, the standard cost could be used to manage books, or the cost of bread.

Those costs that can be fixed for the whole year bring certain advantages:

  • you can base the sale price on the product cost and then work with margins rather than a fixed price per product,
  • accounting is simplified because there is a direct relationship between the value of stock and the number of items received.


To get an automated periodic revaluation of the standard price you can use the action Update on the product form, enabling you to update prices of all the selected products. OpenERP then recalculates the price of the products as a function of the cost of raw materials and the manufacturing operations given in the routing.


Average Price

Working with standard prices does not lend itself well to the management of the cost price of products when the prices change a lot with the state of the market. This is the case for many commodities and energy.


In this case, you would want OpenERP to automatically set the price in response to each goods receipt movement into the warehouse. The deliveries (exit from stock) have no impact on the product price.


Tip: Calculating the price

At each goods receipt, the product price is recalculated using the following accounting formula: NP = (OP * QS

+ PP * QR) / (QS + QR), where the following notation is used:

• NP: New Price,

• OP: Old Price,

• QS: Quantity actually in Stock,

• PP: Price Paid for the quantity received,

• QR: Quantity Received.


If the products are managed as a weighted average, OpenERP will open a window that lets you specify the price of the product received at each goods receipt. The purchase price is, by default, set from the purchase order, but you can change the price to add the cost of delivery to the various received products, for example.

Figure 23.8: Goods receipt of products managed in weighted average


Once the receipt has been confirmed, the price is automatically recalculated and entered on the product form.


23.2 Purchase Analysis


23.2.1 Elementary Statistics


OpenERP enables you to perform analysis of purchases by period (current year, current month, previous month), by state (quotations, orders), supplier, user, product, category, warehouse and so on. This is made possible through a search view accessed through the menu
Purchases à
àPurchase Analysis.


Figure 23.9: Analysis of purchases over the month by product


This analysis is carried out on supplier orders and not on invoices or the quantities actually received. To get an analysis by product, use the module product_margin. The function of this module is described in detail in the chapter Driving your Sales.


To analyze the received quantities, you can use the statistical reports in Warehouse.




23.3 Analytic Accounts


To manage purchases by project, you should use analytic accounts. You can set an analytic account on each line of a supplier order. The analytic costs linked to this purchase will be managed by OpenERP from the goods receipt and confirmation of the supplier invoice. The hr_timesheet_invoice
module lets you re-invoice the analytic costs automatically using parameters in the analytic accounts such as sale pricelist, associated partner company, and maximum amount.


So you can put an invoice order with a defined invoice workflow in place based on the analytic accounts. If you are working Make to Order, the workflow will be:

  1. Customer Order,
  2. Procurement Order on supplier,
  3. Receive invoice and goods from the supplier,
  4. Delivery and invoicing to the customer.


When re-invoicing based on costs you would get the following workflow:

  1. Enter the customer contract conditions from the analytic accounts,
  2. Purchase raw materials and write the services performed into the timesheets,
  3. Receive the supplier invoice and the products,
  4. Invoice these costs to the customer.



Tip: Analytic Multi-plans

If you want several analysis plans, you should install the module purchase_analytic_plans. These let you split a line on a supplier purchase order into several accounts and analytic plans. Look back at Analytic Accounts for more information on the use of analytic accounts.


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This entry was posted on 30/11/2011 by in ERP and tagged , , , , .
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