Adding in more elements in Out XML Profile

This is a GTM question but the mechanism is no difference with OTM.
Client want License info assigned to a Trade Transaction Line to be sent back to ERP as the screening result.
If I do Not choose any out xml profile and send out GtmTransactionLine, there is No License related info on it.
Seeing the License Info on the xsd under GtmTransactionLine, I tried below ways but none worked.
1) Create a Max profile.
2) Create a Min Profile and specify Include Xpath GtmTransactionLine/GtmTransLineLicense/*
3) Create a template by uploading a xml template generated from existing record.

Can anyone give some pointer?
Thanks in advance!