Hi,
Please check following :
1. In POI account assignment category K (Cost center) is selected for that item.
2. Cost center has been maintained in PO (Click on Account Assignment tab).
3. Check transaction code OME9 - Select Account Assignment K and make Cost Center mandatory.
4, Go to transaction code SE38 - give program name as RM07CUFA - execute - enter movement type and G/L - check whether Cost center is Hidden. In case it is hidden it will be shown with - (minus) sjgn. In this case make it visible wherever missing i.e. either in Field Status Group of G/L or Movement type (this will be done by MM consultant).
Hope, this solves your issue else revert.
Regards,
Tejas