DMR Processing - Resolution Codes - Help Needed

We want to remove the “Require Supplier Credit” option from the DMR Processing → Reject → Detail → Resolution dropdown menu.

I tried checking the field help and many of the “Codes” tables and did not see it listed.

Looking at the customization side, the drop-down list items are blank. Does this mean that this list is populated through Epicor background black magic on the module’s launch, or am I looking in the wrong place?