Please let us know the part number. For some parts the DMA tr_out can be connected only to another DMA.
I have run into the same issue. Cannot even connect tr_out to an output pin. There is nothing in the documentation that I could find that indicates tr_out is limited to connect to only DMA for some parts. It would be nice if any connectivity limitations were documented.
In my case I was using a CY8C4248LQI-BL583.