Modelling HL7 Data Gaps

[donw]

I'm quite new to EA and am trying to figure out the best way to model data element gaps.  In particular if I wanted to map a change in content from incoming to outgoing message.  For example:

Incoming Data Message Contains - PID-3.1 (Last Name) == "smith"
Outgoing Data Message Needs to Contain - PID-3.1 (Last name) == "SMITH"  (all upper case)

How could I show this as gap analysis.

Thanks