How to identify mandatory fields for Create, Update, Delete on Business Object using P6 web services

Currently using Oracle Primavera P6 EPPM 18.8

Is there any way to identify mandatory fields on all business objects.

For example:

For creating a UDFValue a list of fields are provided , among these how to identify the mandatory ones.

For deleting a UDFValue, it takes 2 input fields.

How to identify the number of mandatory fields for any operation on Business Objects.