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.