Combine the value from two response fields in a third field
I am writing a SOAP Message Responder. Some of the fields of the response derives its value from a DataSource column while some gets their value from variables populated by an XML Data Bank.
Now my question is how do I combine these values to populate another field in the response. For example, I need a field to be the product of a field that derives its value from a datasource and another field that derives its value from a variable.