BizTalk Create Message in BRE Rule

Question

In an orchestration I notice that if I right-click in a construct message shape and select "Insert Shape" then three options are enabled:

1. Transform
2. Message Assignment
3. Call Rules

I would like to use the Call Rules option, have the rule populate a newly constructed message. Unfortunately, when I select this, I get the message "A Construct statement can only contain Message Assignment and Transform shapes".

Does anyone know if it possible to have a message populated in a BRE rule?

Answer 1

It seems the construct shape isn't required. I guess a copy of the message that's passed into the rule gets created implicitly.