The first characters of the first segment received (up to 19 characters) in a transaction set with all asterisks changed to spaces and excluding the new-line character.

Identifier of a particular data element in a particular segment. Composition of Reference Designator: First two or three characters - Segment ID. Last two characters - Numerical sequence of the Data Element in the Segment when all Data Element positions in the segment are used.

Contents of data element field in error (up to first 12 characters).

Code identifying the type of error.