When you run the Cash Requirements (AP612000) report it only shows documents with a Due Date. For AP Debit Adjustments, the Due Date is pretty much always empty in my environment which means that the AP Debit Adjustments get excluded from the report.
I would modify the report to include the AP Debit Adjustments, but the report is based on some tables that are getting populated with C# code (I assume) when the report is run.
Can you add an option to the report, maybe called Show All Documents so the name is consistent with the Show All Documents checkbox on the Vendor Details (AP402000) screen?
When you select Show All Documents and run the report, all documents without a Due Date (including AP Debit Adjustments) would now be included in the report. If a Due Date needs to be set, you could just use today's date.