In addition to narrative text, the following line formats may be used:
Optional
This field specifies the charges claimed by the Sender, if any.
The structured line format may be used for bilaterally agreed codes.
Any code used in this field must be between slashes and must appear at the beginning of a line.
Narrative text must not begin with a slash and, if used, must begin on a new line and be the last information in the field.