OVH Cost Amounts not split out in PM Subledger Entries.

I have inventory items where the cost details contain amounts for the cost analysis code OVH.  When I run the OPM subledger for source PM, on the sub-event 'Batch Certification', some of the journal entries created are not creating a separate amount for the OVH cost. The OVH cost is being lumped in with the WIP Amount.  On some entries, the entry appears with a debit to INV, a credit to OVH, and another credit to WIP.  This is the way I would like to see the entry created.  However, on other entries, there is only a debit to INV