problem in approval template in sap business one

Actually I have remove in B1i user in approval template, but i reentry in approval template when i add that approval template this error will come into picture __This entry already exists in the following tables 'Users' (OUSR) (ODBC -2035) [Message 131-183]__ . plz tell me how to solve all these problems in sap business one and one more is i don't know about B1i user password.tell me briefly explanation with line by line process.