Hi Rakesh Patil
WIP Variance account will be posted when there is a change in the 'Planned Qty' and 'issued Qty' of Production Order.
Assume as per you BOM,
To make 1 qty of FG you needs
RM1 5 Qty
RM2 10 Qty
Production Order is issued for 5qty of FG. So Production Order would be like;
Item Base Qty Planned Qty
RM1 5 Qty 25Qty
RM2 10 Qty 50 Qty.
Now you issue more quantity than the planned qty say, RM1 you issue 30 Qty, the difference in cost of 5 Qty as per your inventory valuation would be posted to the WIP Variance Account.
Hope Helpful
Regards
Kennedy