In Celigo sometimes we get an error during the syncing of Item Fulfillments: Failed to create, update/transform record because You have attempted an invalid sublist or line item operation. You are either trying to access a field on a non-existent line or you are trying to add or remove lines from a static sublist. Tip: Please make sure that all the line items that you’re trying to use exist on the record.
One reason for this can be back-ordered items in the sales order record. By making a solution in the SO we can remove this error in Celigo