Closing Production and report completion

Dears,

When I am doing a partial report Completion for a Production Order is SAP B1 the below Journal Entry is Correct:

Cr --> WIP

Dr --> FG

Once I an trying to close the Production Order another Journal entry is incorrect:

Cr --> FG

Dr--> WIP

That is Wrong because the FG is zero in this case.

In case the report completion is for the complete quantity the entries are correct:

Cr --> WIP

Dr --> FG

and On Production order closing

Cr --> WIP

Dr --> WIP