Off the top of my head ........

@month returns a number, so it must be a number field, returns the number of the month.

Want the name?
Add a LU table for 1-12 with Jan-Dec. in columns 1 and 2.

If you do a @LU(@month(@date),1) then you will put the result in a text field.
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Better answer
@month$(@date) will return the name of the month.

To put this into the header, you need to put the month function formula in an invisible derived column and call the derived column in the header definition.

Say the derived column is number 4, enter this in the header line:
This report was printed in the month of *PG {?4}*
Make sure the derived column has the "I" for invisible.

Note that the "4" actually represents the physical definition that is derived.  So if you have 4 derived columns, and then delete #2, you only have three derived columns now, but the last one looks like it is number 4.  In this instance it should be referenced as "3", vs. "4".

I got it done Erika.  I was editing my earlier posting when you entered yours.


Never tried this, but this may also work:
*PG { @month$(@date) }*

Edited:   I just tested the line directly above, it does not work.  But the line I submitted with the derived column does work.  But now I can say I have tried it.