Weird Subfile overlay behavior.

I hope you can help me with this one, I'm confused.

I have 2 subfiles.  My main file which is internally described
in the program.  The second one is a subfile and is externally
described.

The first internally described subfile contains 2 records, the
main screen, which is supposed to overlay either the subfile
record in the other file, or another record in the same file.

In my program I can display the subfile record, then overlay the
main record and it works well.

In my program I can display the 2nd internal record, then overlay
the main record, and it works well.

Here's the problem: If I every show the 2nd internally described
record then I can never display the subfile record.  That is, I 
want to be able to alternate between the two, and I can't.

It seems that when the READ statement for the main subfile is reached,
it redisplays the 2nd internally described file record, even though I
am not writing it that cycle.  I don't know how to make it disappear,
other than closing the program and reopening the program.

I have considered trying to close the main display file and reopening
it, but I don't think I'd like the performance hit that would get me.

Here's some snippets of details:
----------------------------------------------------
STR002FM (Internally described file)
A          R DUMMY                                        
A                                      ASSUME             
A                                  1 30'DUMMY RECORD'     
A          R S1                                   
...        
A                                      SLNO(01)   
A                                      CLRL(12)   
A                                      OVERLAY    
...
A          R S4                                                  
A                                      KEEP 

----------------------------------------------------
STR002FN (Externally described subfile)
A          R DUMMY                                            
A                                      ASSUME                 
A                                 13 10'DUMMY'                
A          R SFLHEAD                                          
A                                      KEEP                   
...
A          R SFLCTL                    SFLCTL(SUBFILE)         
A                                      OVERLAY                 
A                                      KEEP                    
A  46                                  SFLDSP                  
A N45                                  SFLDSPCTL               
A  45                                  SFLCLR                  
A  49                                  SFLEND                  
...

----------------------------------------------------
My Program snippet:
FSTR002FM  CF   F 1920        WorkStn                          
FSTR002FN  CF   E             WorkStn SFile(SubFile:SF_RecNum) 

D ShowSubFile     S                   Like(*IN01) Inz(*On)  

C                   Eval      *IN46 = *On     
                                               
C                   If        ShowSubFile     
C                   Write     SflHead         
C                   Write     SflCtl          
C                   Else                      
C                   Except    S4              
C                   EndIf                     
                                               
C                   EXCEPT    S1              

 **** >>> This is where S4 gets shown even if it's not on the display when this 
is reached (seen in debug)                                                      
                    
C                   READ      STR002FM                               06  
                                                                          
C                   If        *INKC                                      
C                   Eval      *INLR = *On                                
C                   EndIf                                                
C                   If        *INKU                                      
C                   Eval      ShowSubfile = NOT ShowSubfile              
C                   EndIf                                                
                                                                          
OSTR002FM  E            S1                                               
O                                           K2 'S1'                      
OSTR002FM  E            S4                                               
O                                           K2 'S4'                      

Regards,

Jim Langston

Me transmitte sursum, Caledoni!
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