Datawatch Monarch--Why can't a HEADER line preview my data?

paultran00
paultran00 used Ask the Experts™
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Datawatch Monarch Data Prep Studio version 15.1.0.18716

QUESTION:

When I trap a header, I can see that it highlighted the rows correctly.  BUT I can't preview the data when I defined the trap as a HEADER line.  When I change the trap line to  a DETAIL, then I see my data and I can export the data.

Why can't a HEADER line preview my data?
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