Projkect Manufacturing and OTL - What is the position with WIP resources costs??

Hi,

My client uses OTL to capture resource hours. They have Project Manufacturing implemented as well.

There would seem to be a question over how to avoid double booking of WIP resource costs - transactions from WIP plus the OTL transactions.

WIP resource transactions fail, as part of the collection process so they don't actually get added, but is there a method of restricting  their entry to the interface table?

I cannot rationalise this. Is there an implied logic that if you are using OTL, then capturing WIP resource costs is not possible?? From a reporting and analysis standpoint, having the resource transactions in WIP is a real bonus, but OTL seems to get in the way.