PO Detail problem with DMT

Any idea how I can find what the CalcTranType is for a PODetail in V8?

I opened the PO entry in Developer mode to see the source for the Purchase To (Stock, Job, Other) and the data source is “CalcTranType”. But that field isn’t in V8’s PODetail table.

I need to know if it is for Other (PUR-UKN) or to a Job.

EDIT: Found it. Its in the PORel table.