WLT cannot be used to track WIP material at non-milestone operations. WIP lot/serials are produced only by milestone operations. Additionally, WIP quantity-on-hand (QOH) balances cannot reside in the input queue of the first milestone operation of any routing. This is true even if the first milestone operation is not the first operation in the routing.

To track WIP material, including the component material consumed and parent items produced, routing operations that consume and produce that material must be milestone operations. Use Routing Maintenance (14.13.1) to update routings for use with WLT.