Bear with me, this might be hard to explain clearly...
 
When we have more than one line item on a repair order (S/RO), we get an error during the posting process. The error comes after the Work Order processing. It also comes after the first line item has posted completely, both in the transaction file and as a serial number transactions. It also appears that the actual WO inventory transaction of the second item has been completed (an R transaction for that serial number shows in the transaction register). The error comes at the point where the serial transaction should be happening for the second line item. The error comes up in a box marked "Information" and it says: "This serial number was found to exist with a qty of 1 at location REP       . Please Try another serial number."
 
The error is rather mysterious, since it seems that, logically, it should be correct that the serial qty is 1. The WO has been processed to create the item and now the invoice should be removing it from stock. Perhaps the invoice transaction is either, 1) testing for the condition incorrectly, or b) attempting to add rather than subtract. Or maybe it is more screwed up than that, because...
 
If I put in a bogus serial number to get past the error then we would expect that the transaction would complete and show an invoice with the wrong serial number. What actually happens is crazy. First, the R transaction changes from showing the serial number entered during WO processing to showing the bogus serial number entered during the end of posting. No transaction posts to remove the item from stock. A new serial table record is created with the S/RO info, but no WO info, and no *location*, which makes that an invalid record if you bring it up in SC-A.  
 
This is keeping us from being able to invoice repairs (again).