The login ID '%1' is already mapped to user ID '%2'

Error constant SQLE_LOGON_MAPPED
ODBC 2 state 28000
ODBC 3 state 28000
Parameter 1 Name of the login ID that is already mapped.
Parameter 2 Name of the user that the login ID is already mapped to.
Severity 16
SQLCODE -249
SQLSTATE 28W08
Sybase error code 13697
 Probable cause