Most likely because those are Request coding tables, not Organization coding tables, in your database. Granted, if I can search from Request Coding Table when doing a full search on Payment records, I can't imagine it'd be that difficult for developers to add that ability to Organization searches as well. Currently it doesn't look like we can even use Advanced search to work around this.
Slight modification of title; marked as reviewed
Most likely because those are Request coding tables, not Organization coding tables, in your database. Granted, if I can search from Request Coding Table when doing a full search on Payment records, I can't imagine it'd be that difficult for developers to add that ability to Organization searches as well. Currently it doesn't look like we can even use Advanced search to work around this.