AX 2012 Excel Add In :: The Given Key

Hello all,

I have created a custom document service that allows for updating of the inventJournalTable+inventJournalTrans lines.  When calling via Excel add in, the service reads the data into the excel worksheet just fine.

However, when I try to publish back to AX, I receive an error "The given key was not present in the dictionary." .  I have compiled, compiled CIL, start/stop refreshed the service, restarted the AOS, updated the AOD.

Any ideas? Ever seen this before?