Sales order return

Hi,

There is sales order return booked in the current month referencing the original sales order of previous month. When the Credit Memo for this sales order return is imported via auto invoice. The credit memo is having the GL date of the original sales order of the previous month. Since the return is done in the present month, the GL date for CM created by the system should have present month's date as the return has happened in the current month.

Why does the CM have the GL date of the previous month.

Please advise.

Thanks

Mythson