Hi Valorie,
Any chance you have something like this going on? Sales Order lines not closing after shipping by just one user
Also, looking at Part Transaction history tracker can show if they shipper was “fiddling” around with shipping the line for some reason; this can cause problems. Lastly, was there a partial shipment and then a complete quantity sent afterwards? I have seen problems with lines not closing due to this in the past. Do you have changelog on the shipment?
Nancy