# Define Message Fields to Conversion Rule Panel

You can define a nested message field (RVMSG) to a conversion rule in the Define Message Fields to Conversion Rule panel.

## Panel Layout

You can access this panel by selecting M in the Sel field of the Conversion Rules panel, selecting a conversion rule that contains nested message fields. For more information about the Conversion Rules panel, see Conversion Rules Panel.

    SXTP03G ---------- Define Message Fields to Conversion Rule -- Row 1 to 1 of 1
     Command ===>                                                   Scroll ==> CSR

       Conversion Id ...: New_Rule1
       Using Message ...: New-Msg1
     Sel Trunc Reqd CvRul Msg Field (type MSG)     | Num Conversion Rule
     -     -    -   ----- ------------------------ | ---- ------------------------
           Y    Y   0                              | 1 New_Rule1
    ******************************* Bottom of data ********************************

## Field Description

The following table lists the fields in the Define Message Fields to Conversion Rule panel:

Field | Description
--- | ---
Conversion Id | The name of the conversion rule that the nested message field is defined to.
Using Message | The name of the message definition containing the nested message field.
Sel | You can select a conversion rule that the nested message field can be defined to. Valid selection: S(elect).
Trunc | Not applicable for nested messages. You can ignore it.
Reqd | Required. You can specify whether the field is required for a conversion. Valid selections: Y(es) and N(o). Default selection: Y. For an inbound process, if you set this field to Y, the transaction is not completed successfully unless a field with this name is encountered in the inbound Rendezvous message. If you set this field to N, no specific check is made as to the availability of that message field in the Rendezvous message. For an outbound process, if you set this field to N, and the data type is numeric and the content of the field is not initialized by the host-side application, the field is initialized by the Transformer and no editing errors occur.
CvRul | The sequence number of the conversion rule that the nested message field is defined to.
Msg Field | The name of the nested message field.
Num | The sequence number of the conversion rule.
Conversion Rule | The name of the conversion rule.

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