WIP Completion of 'Buy' Item results in credit to MOH Absorption Account

Hi All -

We have set up Material Overhead Absorption Rules to 'Earn Material Overhead' for Buy Items during PO Transactions only, i.e. this is the only MOH Absorption Rule that we have defined.

When a Work Order is defined and completed for a 'Buy' Item, the MOH Absorption Account is credited for the amount of the Material Overhead.  Is this expected functionality? Is there a setup we can configure so that the MOH Absorption Account used for WIP Completion is not the same account used during PO Receipt?

Thanks in Advance.