¿How to default TRU from User Defined Table (UDT)?

Summary:

We want to default TRU when there's a specific Legal Employer and Location.

Content (please ensure you mask any confidential information):

This works corrcorrectly

We have many combinations of Legal Employer and Location, that's the reason why we want to use a UDT, but I don't how to pass dynamically the information, in our case, theoretically the variable: rowVar_HrAsgRow.Legal Entity ID should be our Column of UDT and rowVar_HrAsgLocation.Location ID the row, but those field are not aceptable as parameters in UDT function. ¿Can you help us to know if that possible or if we need to do it manually with all combitations with if statements?