Problem

TSO GUI with a BD2 Mailbox

Using CLISTs : ISPPEL and PELXFER

How to use that UI when using a DB2 mailbox

Resolution

This interface is not supported as is, with a DB2 Mailbox.

The CLIST ISPPEL contains VSAM Mailbox allocation custom file name:

ALLOC FI(MAILBOX) SHR DA('IIIIIIII.INTERPEL.MAILBOX')

It cannot be used with DB2 Mailbox.