Forecast requirment not consumed by sales order

Hi,

Material has backward consumption of 12 days in ecc and apo. In ecc system the incoming sales order consume the forecast requirement whereas in apo it fails to consume. In both the system same calender is maintain, in apo it has consider the weekly off while calculating the backward consumption thus the forecast requirement falls 13 days behind the sales order.

I request to the community to suggest the solution to correct the inconsistency between apo and ecc.

Thank you,