Salary and Assignment Changes Report

Content

Hi all - I am working on a few changes reports, and the next one we are working on is assignment changes AND salary changes.  I am very comfortable with doing an assignment change report and I see many posts about salary changes (https://cloudcustomerconnect.oracle.com/posts/c3bb8a6538).  I very well could be missing it, but how do I do both?  When I've tried doing both, I get dates that I do not know how to code around.  Please help

I've attached my starting code ... once I get that set, I will set the old/new code but need this to work first.