I am currently receiving the error “message”: “entity : The property ‘RMADisp1’ does not exist on type ‘Erp.RMADisp’. Make sure to only use property names that are defined by the type.\r\n”,
when trying to add a new RMA Disposition using Postman. (sending as JSON).
Why do you think it should have a 1 at the end? And RMADisp needs to be unique for the RMA Num, Line, and Receipt. Are you trying to set data on an existing disposition, or trying to add a new one?
The error message doesn’t quite fit this idea, but I’ve found the REST API to be intolerant of missing fields. The example JSON in my help page has a lot more fields than you’ve shown us.