How to include Requirements from custom Library into Traceability Matrix

Hello,

I want to generate a Traceability matrix for my model's code to check for all linked requirements. The main functionality of my model is implemented in custom libraries.

In the traceability matrix, the blocks from the libraries are listed as expected. However none of the requirements linked to the blocks are listed. I cannot find what I have to change to include the requirements into the matrix.

Thanks for the help Tobias