Simple Subfile question

I don't work on subfiles too often, so this is really a simple question
but...

I am writing a new program and display file with a subfile.  I loaded the
subfile with dummy records and all is well.  Now I am ready to read my
real file, etc.. and I am displaying my screen for user input.  Now I'm
getting a session or device error, and I'm sure it's being caused by the
subfile being empty.

How do I display my subfile with empty records?  Or do I have to check
my SF_RecNum and only display it if it's not zero?

  *** Clear Subfile ***                             
 C                   Eval      *IN55 = *On          
 C                   Write     SubCtl               
 C                   Eval      *IN55 = *Off         
 C                   Eval      SF_RecNum = *Zero    
                                                    
 C                   DoW       NOT (*IN03 OR *IN12) 
                                                    
  *** Display Subfile and get input ***             
 C                   Write     Footer               
 C                   Write     Header               
 C                   Exfmt     SubCtl               
                                                    
 C                   EndDo                          

bombs out on the Exfmt SubCtl with
Session or device error occurred in file MNTSTGDFM (C G D F).

However:

  *** Clear Subfile ***                             
 C                   Eval      *IN55 = *On          
 C                   Write     SubCtl               
 C                   Eval      *IN55 = *Off         
 C                   Eval      SF_RecNum = *Zero    
                                                    
  *** Load some dummy records ***                        
 C                   Eval      DFType = '* Test1 *'      
 C                   Eval      DFUnit = 100              
 C                   Eval      DFSplt = 10               
 C                   Eval      DFCuFt = 100.101          
 C                   Eval      DFAmnt = 1000.01          
                                                         
 C                   Eval      SF_RecNum = SF_RecNum + 1 
 C                   Write     SubFile                   

 C                   DoW       NOT (*IN03 OR *IN12) 
                                                    
  *** Display Subfile and get input ***             
 C                   Write     Footer               
 C                   Write     Header               
 C                   Exfmt     SubCtl               
                                                    
 C                   EndDo                          

works, but is obviously not what I want.

Regards,

Jim Langston
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