Data element attribute error_indication that a data element does not conform to the relevant message or segment specification.

Data segment missing/invalid_notification that a data segment is missing, contains invalid data or cannot be processed for any reason.

Too many data elements in segment_indication that a data segment contains too many data elements.

Service segment missing/invalid_notification that a service segment is missing, contains invalid data or cannot be processed for any reason.

Message version/release not supported_notification that the message type, version number and/or release number in the ung and/or unh segments are not supported by the recipient.

Una not supported_notification that the una character string cannot be understood or complied with.

Password invalid_indication that the password in segment unb is invalid.

Addressee in error_notification that the recipient stated in unb does not conform to the actual recipient.

Syntax not supported_notification that the syntax identifier, version and/or level specified in the unb segment is not supported by the recipient.

Mandatory data element missing_indication that a mandatory data element is missing in a service or data segment.

Trailer check in error_notification that data contained in the trailer does not agree with data in the header and/or that the functional group or message or segment count is incorrect.