2590931 - Physical Inventory Count Ignores Key Date

The issue will be explained by the following example, where all the provided values are for example purpouses only:

You are performing a Physical Inventory Count on 01.09.2018 (set as a Key Date) and you are entering the results on 09.09.2018. In the meantime (the period between 01.09 and 09.09) there are changes in stock and the system is considering those changes in the PI Count document. 
You are expecting that you should be able to enter the Actual Quantity for the Key Date  and not for the date when the document is created.

SAP Business ByDesign

KBA , AP-PIP , Physical Inventory Processing , AP-PIP-PIC , Physical Inventory Count , Problem