WIP - Backflush Issue

 Hi,I need some help on a issue which has left us wondering whats going on!!

Here is the process we follow and error we see.

1.) We do WIP completions/Reversal through WIP open interface using wip_move_txn_interface table.

2.) Run Move transaction Manager.

3.)We expect to see thw quantity Completed on WIP Discrete Job Screen. Wip Completion transaction in material transaction for the qty & WIP Issue transactions in material Transaction with corresponding qty (depending on Per Assembly/Yield Factor).

WIP JOB - 166967

Qty Completed  - 650

All the components have correct quantity issues except one which issued only 500 instead of 650.