Change POLineRel Search

I would like to customize the fields that are displayed on the POLineRel search when the user clicks the button on the Receipt Entry->Lines tab. I found the method that calls it but I am not sure how to code the BPM to modify what is displayed. I have done this in code from a base search but since this isn’t the base search that won’t work (at least not from the Receipt Entry form).

I tried a quick search but that only returns one value, where the Line/Release is 2.

What is the best way to customize that form?
Base:

Desired result:
image