while exit from the dsply fiel its adding a blank record with 0'

Hi all,
   
  i am adding records to a physical file through a dsply file while exit from 
the dsply file it adding a blank record to physical file.
   
  can any body help me, bellow is my code.
   
   
  RPG Code

  0002.00 FSTUDENT   IF A E             DISK        
0003.00 FSTDNTDSP  CF   E             WORKSTN     
0004.00 C                   DOW       *IN03=*OFF  
0005.00 C                   EXFMT     DSTUDENT    
0007.00 C                   EVAL      SID =dSID  
0008.00 C                   WRITE     STUDREC     
0010.00 C                   enddo                 
0011.00 C                   return                 
   
  PF code
  0002.00      A          R STUDREC             
0003.00      A            SID            3S 0 
   
  Dsply file 
                                          CA03(03 'F3=EXIT')       
 A                                                               
 A          R DSTUDENT                                           
 A                                  5  5'ENTER THE STUDENT ID : '
 A            DSID           3S 0I  5 35                         
 A                                 22 20'F3=EXIT'        
   

   TIA
   Shiva Shanker        



                                
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