z/VSE security: Do you still use the CICS transaction security table DTSECTXN ?
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Before z/VSE 3.1.1, CICS TS transactions were protected using the access control table DTSECTXN.
You can migrate the DTSECTXN definitions to the BSM control file on either your source or on your target system. The migration is described in detail in Migrating CICS Transaction Security Definitions of the z/VSE 6.1 Administration book. You may download it at z/VSE 6.1 GA from the z/VS
Starting with z/VSE 6.1 the Define Transaction Security (DTSECTXN) dialog has been removed. You can use it only on the source system.
You can assume that the support for DTSECTXN will be removed in a later z/VSE release. Therefore I recommend to migrate your transaction security definitions to the BSM control file.