The login ID '%1' has not been mapped to any database user ID

Item Value
SQLCODE -313
Constant SQLE_INTEGRATED_LOGON_UNMAPPED
SQLSTATE 28W09
Sybase error code 13698
ODBC 2 State 28000
ODBC 3 State 28000

Probable cause 

You attempted to drop a login ID that had not been mapped yet