Hi Abhi,
What Ajay sir is said right. In our project also we use CKMDUVACT and CKMDUVREC for distributing the quantity differences.
But here we have ML activated. If as per the Ajay sir has said if it can be executed with out ML activate please check this.
And also the Labour activity has to be posted to the PCC as per the planing. Other wise you can not post any diff using these tcodes.
Regards
Dinakar Sarma