Please configure the inventory detail in line XX of the item list.

Troubleshooting NetSuite SuiteTalk ItemFulfillment add error "Please configure the inventory detail in line XX of the item list."..

In order to determine the cause of the error we need to find which item is in line XX of the item list. We cannot use the orderLine of the sales order because this error is related to the item fulfillment.

Download the request from Setup -> Integration -> Soap Web Services Usage Log and open it in a editor capable of collapsing xml.

Collapse the item list down and count the number of items starting with 1 to XX to find the item causing the issue. 

Open the item in NetSuite and view the inventory detail tab. Verify that there is inventory at that location and that it has been assigned to a bin. In this case there was inventory at the location but it hadn't been assigned to a bin.