The ADATA exit is not called if you specify the NOADATA assembler option. If you want to process the associated data records in the exit, but you do not want the assembler to write the records to the normal output data set, you can do one of these actions:

• Instruct the assembler to discard the associated data records by setting the exit return code.
• Suppress the associated data output by doing this action:

  z/OS

  Provide a //SYSADATA DD DUMMY JCL statement.

  CMS

  Issue a FILEDEF SYSADATA DUMMY command.

  z/VSE

  Assign SYSADAT to IGN.