Screen behavior with subfile

["James W. Kilgore" <qappdsn@xxxxxxxxxxxxx>]

Howdy,

I've got a screen behavior that I just can't figure out so I'm asking
for some help.

I've cleaning up a WRKxxxx program used by order entry and it's got the
following screen components:

SIWRKHDR - screen headings, lines 1 & 2
SIWRKCTL - subfile control, lines 3 -> 9
SIWRKSFL - subfile detail, lines 10 -> 20
CMDDSP - function key display, lines 21 - 23
ERRSFL - error message subfile, line 24
SIWRKEDT - edit panel for making changes, lines 5 -> 21

Normally I would put SIWRKEDT into a window, but because of the amount
of data I'm using a record instead.

The processing loop is: (ignore spacing)

EXIT$    DOWNE 'Y'
         WRITE SIWRKHDR
         WRITE CMDDSP
         WRITE ERRSFL
         EXFMT SIWRKCTL                90

STATUS   CASEQ 00002        $CFKEY
         CAS                $ENTER
         END

         ENDDO

Now the first time it goes through this loop, it displays just the way I
want it.
I take an option on a detail line, subroutine $ENTER is called and panel
SIWRKEDT
is displayed and processed.  The the program returns to this loop but
the SIWRKHDR and CMDDSP is not shown.  I put a FRCDTA on the panels and
can see that they are in fact being written, but the EXFMT SIWRKCTL
clears the screen.  All panels except SIWRKHDR have the OVERLAY keyword.

Now if I press ENTER, with no detail options selected, and the loop is
processed again, it shows correctly.  In other words, routine $ENTER is
run and the READC loop within it does not find any changed records and
therefore SIWRKEDT panel is not displayed.

I know for sure that the SIWRKHDR is being written, but why does the
SFLCTL clear the screen only after SIWRKEDT has appeared?

TIA

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