Trying to patch UD fields through the UBAQ rest api in Postman, but i get the following error
I believe I need the SysDate field as it’s a key field according to the update tab in my BAQ, however passing the value I get from a GET request doesn’t seem to work
"PartTran_SysDate": "2024-03-18T00:00:00-04:00",
There isn’t a BUsiness Object to do [C]RUD operations on PartTran your best bet is to write an Epicor Function that does a Db Write.
And he only said that because for once, he did read that you said “UD Fields”, because this was a short post. 
Be careful with PartTran!
is it Rest v2? try v1.
@Olga @josecgomez thanks for the responses, it looks like using REST v1 works for my use case here, i’ll look into using a function if it doesn’t pan out.