TCC Union script?

Summary

Does anyone have a sample TCC script with a union?

Content

I'm looking for a TCC script that performs a union on data from the User entity.    Here's what I'm trying to do:

1. String value ''Line Manager"
2. projection: first name
3. projection: last name
4. projection: employee ID

UNION

1. String value ''Dsg Manager"
2. projection: first name
3. projection: last name
4. projection: employee code

where employee status=active

 

The xml I found in the TCC user guide hasn't helped much.  I've tried adding xml as both a Complex Projection and a Subquery (Advanced Tab) but I keep getting 'Source is Not Valid' errors.  Can anyone tell what I'm doing wrong?  Can anyone tell me what's wrong with the xml below (added as a subquery)