SSRS Breaking/Routing

When setting up SSRS Breaking/Routing for emailing a customer invoice, is there a way for the Calc_CustEmailAddress to only look for the email listed on the Customer.EMailAddress, not the contact email?

The Calc_CustEmailAddress currently takes the “Billing Contact” and if one is not specified, it chooses the first contact listed.

Thank you,

As long as the field is not excluded in the report data definition it should be showing as a choice when selecting a field.