Email Sender Address ABAP Error in ABSL

Hi,

I have this requirement when sending email via workflow, that in the sender email address has to be dynamically set based on custom logic. I tried this feature regarding DetermineSenderEmailAddress Business Add-In to Determine Sender E-Mail Address (sap.com) but when I'm trying to pass the variable queried from the Business Object to reuse function to get the email dynamically it returns me an abap error. Does anyone tried this feature before? or am I missing something?

Regards

Jayson