Undeclared tag ID: '%1'

Error constant SQLE_UNDECLARED_FOR_XML_EXPLICIT_TAG
ODBC 2 State ERROR
ODBC 3 State ERROR
Parameter 1 The value of the undeclared tag ID.
Severity 16
SQLCODE –901
SQLSTATE WX009
Sybase error code 13580
Probable cause

Every value appearing in the Tag column of the table must be declared in the TagNumber field of at least one column name.