We have a similar program and it requires the following;
display file created with RSTDSP(*YES) we also use DFRWRT(*YES)
On the record format(s) use OVERLAY
You also require a dummy record which needs to be in the display file but 
not needed to be referenced in the RPG program
A* 
A          R DUMMY 
A                                      ASSUME 
A                                  1  3' ' 
We also have record formats to suit both *DS3 and *DS4 (24 x 80 and 27 x 
132) depending on the screen size of the calling program.
Cheers
Don
From:   "Howie, Bill" <BHowie@xxxxxxxxxxxxxxxx>
To:     "midrange-l@xxxxxxxxxxxxxxxxxx" <midrange-l@xxxxxxxxxxxxxxxxxx>
Date:   03/04/2020 12:55 AM
Subject:        Pop-up calendar program and retaining previous display
Sent by:        "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxxxxxxxx>
Hello all,
I'm currently working on a subfile program.  The user can press a function 
key to subset the data in the subfile by date.  I've got a pop-up calendar 
program that displays the calendar in a window for the user to select a 
particular day.  Every time the calendar displays, the subfile disappears. 
 I initially thought this was some combination of the use of the OVERLAY 
keyword but I've not been able to hit upon the combo that works yet.  This 
is one program calling a second program, so I'm not sure how that plays 
into it.  Am I on the right track with the OVERLAY keyword or no?  All 
info appreciated!
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