insert a value into a physical file through disply file its updateing as '0'

Hi all,
   
  When i am trying to insert a value into a physical file through disply file 
its updateing as '0'
   
  bellow is the code, any body can help me out.....
   
  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    
0006.00 C                                         
0007.00 C                   EVAL      DSID = SID  
0008.00 C                   WRITE     STUDREC     
0009.00 C                                         
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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