Use the Definition of Field pane to modify existing or define new fields.
Click the field name in the Defined Fields pane. The selected field’s
definition displays in the Definition of the Selected Field pane.
Edit the field’s attributes as required.
For Type, click
the arrow to open a list of data types.
For Length,
click the arrow buttons to select the maximum number of characters that one
instance of the field can occupy in a message. Include component and
subcomponent separator characters in this calculation. Select Unlimited for an unlimited
field length.