If you are sending updates, I know that FME was only supporting/requiring that the ObjectID field was included in your service and included in all your update requests (they don't support any other names besides that last I knew).
If that doesn't work, I suggest you try enabling debugging logging on your arcgis server and try running again and see if your ArcGIS Server can provide any additional details.
If you are sending updates, I know that FME was only supporting/requiring that the ObjectID field was included in your service and included in all your update requests (they don't support any other names besides that last I knew).
If that doesn't work, I suggest you try enabling debugging logging on your arcgis server and try running again and see if your ArcGIS Server can provide any additional details.
I do have the ObjectID field but will check the debugging log for more info