Hi,
If I understand your issue correctly, you have test cases in project A, and are raising defects for those test cases in Project B, and are having trouble linking defects between the two projects.
I'm using Zephyr Scale Server and am able to do this. Here's how it works for me:
In the test execution
Scroll down to the Issues section
Click on the down-arrow (to the right of the + button)
Select "Search Issues"
On the left-hand side, click on the Project button which should show the name of Project A, and select Project B (you can multi-select)
Search for your defect and add the link
You can also do the same from the point of view of the defect - linking that defect in Project B to a test case in Project A, using the Traceability option and following the instructions above which should be very similar.
Hope it helps.
Andy
