Automatic posting question: differences between bsd and prd

Question

Hi to everyone. Although I searched for everywhere I know (including SAP help) I couldn't find a proper answer for my question "what are the differences between transactions "BSD - inventory posting" and "PRD - Cost (price) differences" ?". it seems as if both of thhese transactions are posting in case of cost differences between goods receipt and invoice receipt (and also there must be a stock movement). I will be very thankful vor a dtailed answer.
thanks in advance.
Mehmet Akif EREK
MM module responsible

Answer 1

Hai,
Both BSD & PRD are the Pre defined Transaction event keys used in a SAP Std system. TO understand the BSD, firstly know the BSX ( diff bet BSX & BSD ).
<b>• Stock posting (BSX)</b>
This transaction is used for all postings to stock accounts. Such postings are effected, for example:
o In inventory management in the case of goods receipts to own stock and goods issues from own stock
o In invoice verification, if price differences occur in connection with incoming invoices for materials valuated at moving average price and there is adequate stock coverage
o In order settlement, if the order is assigned to a material with moving average price and the actual costs at the time of settlement vary from the actual costs at the time of goods receipt
Because this transaction is dependent on the valuation class, it is possible to manage materials with different valuation classes in separate stock accounts.
Caution
Take care to ensure that:
o A stock account is not used for any transaction other than BSX
o Postings are not made to the account manually
o The account is not changed in the productive system before all stock has been booked out of it
Otherwise differences would arise between the total stock value of the material master records and the balance on the stock account.
Account determination of valuated sales order stock and project stock
Note that for valuated sales order stock and project stock (special stock E and Q) and for the transaction/event keys BSX andGBB, you must maintain an account determination to avoid receiving warning messages when entering data (purchase order or transfer posting) for valuated stock.
During data entry, the system attempts to execute a provisional account determination for GBB for valuated stock. The system will only replace the provisional account determination for GBB with the correct account determination for the stock account (BSX), in the background, if you enter the data for valuated stock at a later point in time.
<b>Supplementary entry for stock (BSD)</b>
This account is posted when closing entries are made for a cumulation run. This account is a supplementary account to the stock account; that is, the stock account is added to it to determine the stock value that was calculated via the cumulation. In the process, the various valuation areas (for example, commercial, tax), that are used in the balance sheet are taxed separately.
Now the details of <b>PRD T/E key :</b>
Price differences arise for materials valuated at standard price in the case of all movements and invoices with a value that differs from the standard price. Examples: goods receipts against purchase orders (if the PO price differs from the standard pricedardpreis), goods issues in respect of which an external amount is entered, invoices (if the invoice price differs from the PO price and the standard price).
Price differences can also arise in the case of materials with moving average price if there is not enough stock to cover the invoiced quantity. In the case of goods movements in the negative range, the moving average price is not changed. Instead, any price differences arising are posted to a price difference account.
Depending on the settings for the posting rules for transaction/event key PRD, it is possible to work with or without account modification. If you use account modification, the following modifications are available in the standard system:
o None for goods and invoice receipts against purchase orders
o PRF for goods receipts against production orders and
order settlement
o PRA for goods issues and other movements
o PRU for transfer postings (price differences in the case
of external amounts).