this is a custom record field. i want the record to show up as a list on vendor prepayments but it's not showing up there. its showing up on other transactions though. Anybody know what i did wrong?

What subtab did you select for the parent subtab?

i left it blank because i was just going to keep it under custom while i worked on it, i just tried moving it around and it's moving around on other records, but not prepayments. is there some kind of limitation on prepayments?

Did you try creating one and putting the vendor prepayment transaction as the parent? It should show up there, if so.

Yes I tried setting one but the list still did not show up

Did you check the form definition for vendor prepayment? I assume it has a form, never used that record type