How to un-link a FND_USER from from SSO in EBS R12
If we want to unlink any Oracle application user from SSO then we can use below script.
Run the EBS script
sqlplus apps/******
sqlplus: @$FND_TOP/patch/115/sql/fndssouu.sql USER_NAME
Apart from setting the FND_USER.USER_GUID value to NULL, this script also flushes the workflow entity cache for the user.