Troubleshooting

I did a quick test on mine, switching from Part A to Part B just to see if it would fail like it did for you.  In my case, the test data I put in Part B did wind up on the TP-1079.8.BE-V.   For clarity, the T1135 was like this:

The checkboxes on your T1135 are probably as shown here, but I just wanted to make sure you ticked both red boxes in case it was that simple...

I fully understand the frustration...  Good luck!