Issue with the Sales order

Hi Community,

I need your valuable advise to fix a problem:

There is a sales order and it has both the unit price and extended amount until the invoice was printed and the quantity was relieved at the time of shipment confirmation and the costs were updated on the item ledger.

But after the invoice program was executed, few hours later R42950 was executed by the user and this program updated the Extended amount on the sales order to Zero. I want to know why this happened.

Now the situation is:

1) Item Ledger(F4111) has the quantity and amount updated for that sales order.