How to change FromAddress to distinguish between ServiceRequest and Incident GlobalAddresses for Journal email when clicking the New Email Button?
You may have 2 different Global Address for a ServiceRequest and Incident email listener since Journal.Email is a shared object.
Create an initialization rule for FromAddr field to distinguish between the address for the Global Address for Incident and Service Request for Journal.Email object.
$(if [Incident#.]IncidentNumber != null
else if [ServiceReq#.]ServiceReqNumber != null