Stuck on Embedded Report filter/setting

I have a table with a input form containing a embedded report. I tested a few yesterday and all worked just fine. In the midst of adding/updating a column at setting changed I can't wrap my head around. 

When I few a 'purchase order' - the associated embedded purchase order report defaults to a purchase order #1, not a corresponding one. For example if I view Purchase Order #19, it used to embed a report for PO 19, now it just shows blank. But if I goto Purchase order #1, it show the correct embedded report of PO#1.

I attached some examples hoping it helps explain my situation, but I found a setting on the embedded reports where it has a filter, it's set to Purchase Order#1, but the options in the dropdown are just the current test POs that have been entered. I don't see a way to "auto associate" it based on what I am viewing so if I am viewing PO 19, embedded Purchase Order #19's details.