Question on a SOAP integration from our WMS trying to create an Item Fulfillment from a Sales Order - we recently started getting an error Code=INVALID_INITIALIZE_REF] You have an invalid sales order 12345 or the order is already closed. The sales orders are are all in Pending Fulfillment with no payment hold, not locked. This started happening a few days ago. The odd thing is occasionally one will actually succeed (about 1 out of 10). Successes are using the same form, Customer successes and failures are all categories, items on successes and failures don't seem to differ. We have turned off any new workflows and scripts and have not been able to find the root cause. The integration is running on Concurrent Web Services User. Any thoughts? Seems like it is something simple that must have changed, but the occasional successes have me stumped.

I see this invalid or closed error in scripting when there are no order lines eligible to be fulfilled. That can be because all lines have been previously fulfilled or no inventory available. Generally if you click the Fulfill button in the UI for those orders it will bring up a blank item fulfillment and a pop up message informing the user. We used to have problems where inventory was received but not placed in a bin. That caused this error a lot. Not super specific but maybe gives some ideas.