Cannot change synchronization user_name when status of the last upload is unknown.

Item	Value
SQLCODE	-867
Constant	SQLE_CANNOT_CHANGE_USER_NAME
SQLSTATE	0AW13
Sybase error code	13871
ODBC 2 State	37000
ODBC 3 State	42000

Probable cause

The synchronization server uses the user_name to track synchronizations. If the status of the previous upload is unknown then you must resolve this condition before changing the user.