An invoice header file contains a customer number (CUSTNO). Add the customer name (CUSNAM) to this file as a virtual field.
The customer name must be extracted from the customer master file which is called CUSTMST.
Step 1 - Define the Virtual Fields
 
 
     Seq    Name__________ Description______________________
      10    CUSNAM         Customer name
 
 
Step 2 - Input RPG Section "File Specifications"
FCUSTMST IF  E           K        DISK
Step 3 - Input RPG Section "External Record Format or Field Renames"
I*
I* VC_USING FIELDS((CUSNAM $$$$$$))
I*
IRCUSTMST
I              CUSNAM                         $$$$$$
Step 4 - Input RPG Section "Calculations After Input from File"
>
C*
C* VC_USING FIELDS(CUSTNO CUSNAM)
C*
C                     MOVE *BLANKS   CUSNAM
C                     MOVEL'N/AVAIL' CUSNAM
C           CUSTNO    CHAINRCUSTMST             70    70=IGNORED
Note:

• In the external field rename section the $$$$$$ name has been used to cause the internal name of CUSNAM to be inserted at the correct point without replacing the CUSNAM value which must remain unchanged in this context.
• A simpler solution to this example would be to create an access route from the invoice header file to the customer master file with a 1 to 1 relationship and define a predetermined join field on the access route to receive the customer name. For further information on access routes and predetermined join fields refer to What Is a Predetermined Join Field?.

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