Missing WIP calculation in prev period

Hi

I have a problem with production orders, to which some goods have been issued in eg. period 11, but the confirmation (CNF) is made in period 12 (01.12.2013). When I execute the WIP calculation in new period (02.12.2013), I do not get any WIP numbers end of period 11... I believe it is due to that the order got status CNF in current period when the WIP job is executed.

How to solve this issue - am I able only to include 'status' for the single production order up to a WIP period so status changes in new period is not taken into account when the WIP is executed in period 11?

Thank you in advance.

BR

Søren