Create and route an event of this type in order to request a helper dictionary that supports lookup of field position for a given field name. The response is provided by a DataViewFieldLookup or DataViewException event.
Syntax description
msgId is an optional field for a message ID that applications can use to identify responses.
dvName is the unique name for the DataView definition whose field positions you want to look up.
extraParams is an optional field that future implementations may use.