Indication of the point of error in a message.

To indicate the exact segment location of an application error within a message.

Code specifying a particular part of a message.

The referenced number allocated to an identifiable item in a message. eg Customs item or invoice item.

The reference number allocated to an identifiable sub-item in a message. eg: invoice line number.

Tag of a segment.

Number indicating the position in a sequence.

Specification of the source for a specified sequence number in a coded form.