JDELaunchUBEEX2

I am looking for some additional insight into JDELaunchUBEEx2 for tools 9.2.2.4. We have a custom application that allows our business users to import invoice numbers from a spreadsheet, click OK, and it will submit an Invoice reprint for each invoice entered. This works very well with no issues except one. If the user submits 500 invoice numbers, while the application is running through each grid line and submitting the UBE ASYNC, any other user on the system submitting a UBE, their UBE goes into a WAIT state in WSJ even though there job queues open and the ube should