Prerequisites

7.2.5.1 Prerequisites

You must define the mirror transactions and their TWA size in transactions.desc. The definitions can be CICS system mirror transactions CSMI/CVMI or customized mirror transactions. For more information, see Supporting TWA in ARTDPL.
The following example defines two mirror transactions. CSMI is the system default mirror transaction; MIR1 is the user-defined mirror transaction.
```
CSMI;SIMPAPP;system default mirror tran;DFHMIRS; ; ; ; ; ; ;ENABLED; ; 
; ; ;15000
MIR1;SIMPAPP;user defined mirror tran;DFHMIRS; ; ; ; ; ; ;ENABLED; ; ; 
; ;10000
```
Specify the target mirror transaction and its TWA size in the request to ARTDPL, the following FML32 fields must to be present:
```
CX_TRANSID:
```
Specify the target mirror transaction to be used in executed DPL program. If CX_TRANSID is not present in the request, system mirror transaction CSMI/CVMI will be located. If CSMI/CVMI is not present in transactions.desc, SYSIDERR occurs. If the specified CX_TRANSID is not a valid mirror transaction defined in the transactions.desc, SYSIDERR occurs.

Parent topic: Mirror Transaction and TWA