MM:Price Change did not Carry forward from previous to current period

Hi Gurus,

Client has Reported that the Weighted Average Cost (WAC) was automatically  reset to Zero in a particular Period and didn’t carry over from the previous period , The initial analysis was done and it was found that there is a configuration for “Price Change in Previous Period and not in current Period” which has to be maintained for the company code

The question is whether this configuration (“Price Change in Previous Period and not in current Period”) impacts both the Standard Price and
WAC or does this impacts only Standard price

Any pointers will be helpful, Will also Award Points

Regards