A 267-character message:

07.59.07 IST1282I MESSAGE FROM ISTEXCAA IN ISTEXCAA
IST1405I     THIS IS A MULTILINE MESSAGE WHICH CONTAINS 267 CHARACTER
IST1405I     S OF TEXT PROVIDED BY THE SESSION MANAGEMENT EXIT: ISTEX
IST1405I     CAA. NOTICE THAT THE TEXT IS DIVIDED INTO 56 CHARACTER S
IST1405I     EGMENTS AND PLACED INTO IST1405I MESSAGES WITHOUT REGARD
IST1405I      TO SPACES OR ANY OTHER SPECIAL CHARACTERS.
IST314I END

If this problem is not causing the display error, you must determine whether the problem is caused by the session management exit or by VTAM® exit services. In order to determine whether the problem is caused by the session management exit or by VTAM exit services, the input to VTAM exit services should be examined. The following MVS™ SLIP command can be used to trace the input passed to VTAM exit services by the session management exit:

  SLIP SET,IF,PVTMOD=(ISTIECXS,0),A=TRACE,
       TRDATA=(1R?,+13,1R?+C?,+7,1R?+C?+4?,+nnnn),J=NET,END

where:

ISTIECXS

The name of the VTAM exit services module.

NET

The job name VTAM (be sure to use the job name VTAM as it runs on your system).

Register 1

Points to the VTAM exit services parameter list (EXSPL) (X'14' bytes long).

EXSPL+C

Points to the EXMPL (X'8' bytes long).

EXMPL+4

Points to the message text passed by the session management exit.

nnnn

The length of the message text passed by the session management exit to VTAM exit services. The nnnn value should be specified in hexadecimal and should be one less than the actual length of the message text.