ADCS return value to miniform

i've looked and cannot find an answer to this question...so i'm going to lay out a simple example.

Miniform has one field where you scan something into the input.

How can i print what the user scans onto the miniform and return it to the user?


example of Miniform:

Scan Field: ___________

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User Scans "SO12345"
Miniform AFTER user scans SO12345:


Scan Field: SO12345

You Just Scanned SO12345

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What is the best way to return something to a miniform?

MESSAGE('You just Scanned %1',Scanfield) does not work.

ERROR('You Just Scanned %1',ScanField) DOES work, but this doesn't seem right, and sometimes freezes up.