PRD and KDM keys are hitting

Question

Dear All,
After doing MIGO a/c entries are correct for import purchase order.
but KDM and PRD keys are getting hitted and some amount is getting debited to G/L which is assigned to KDM key in OBYC and same amount is getting credited in G/L which is assigned to PRD key in OBYC. Thus effect is zero but i am not able to understand why these keys are hitting as there is no price difference.
please let me know the reason if someone went thru same thing.
Naren.

Answer 1

Dear NArendra
1. Transaction event key KDM will be trigerred when we post invoice first and later on there will be a exchange rate difference occured by the time Goods receipt takes place and also if the material having Standard price control.
Exchange rate differences in the case of open items (KDM)
Exchange rate differences in the case of open items arise when an invoice relating to a purchase order is posted with a different exchange rate to that of the goods receipt and the material cannot be debited or credited due to standard price control or stock undercoverage/shortage.
2.  Transaction event PRD will trigger on different reasons. Material maintained with price control Standard price and the Price in PO is different . Ple3ase refer SAP std documentation on PRD.
Price differences (PRD)
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:
a. None for goods and invoice receipts against purchase orders
b. PRF for goods receipts against production orders and
c. order settlement
d. PRA for goods issues and other movements
e.  PRU for transfer postings (price differences in the case of external amounts)
warm regards
Ramakrishna