For some reason, I can only append one feature at a time into an existing AGOL feature service.
I bring the feature service layer into Pro, plus a local data source (typically a file geodatabase). I then run the Append gp tool, mapping the fields appropriately. It appends the first feature, then fails with the following message:
Start Time: Friday, 31 March 2017 9:41:20 AM
ERROR 999999: Error executing function.
General function failure [Cannot insert duplicate key row in object 'user_2456.BOAT_SURVEY_DEMO_FISHSPECIES' with unique index 'GlobalID_Index'. The duplicate key value is (9bc2a5e1-d2e2-42fd-9802-7caa78b1c739).
The statement has been terminated.]
Failed to execute (Append).
At first, my local data had no global ids, so I tried adding them, but no change, even if I ticked 'preserve global ids' in the append tool (although that failed with a different message).
Has anyone else experienced this, know what is going on, and/or have a fix?