3703340 - 900-001-6 Occurs when trying to save the Job Requisition - Recruiting Management

After making changes to a job requisition the user tries to save the job requisition and receives an 900-001-6 error and the changes are not saved. 

SAP SuccessFactors Recruiting Management 

1. Open Job Requisition 
2. Make a change to the Job Req.
3. Scroll down and click save.
4. Error message "900-001-6" is presented.

Possible cause due to a onSave Business Rule updating or setting an operator. 

Check the Business rules to see if you have any onSave business rules being used to add and operator or change the operator. 

Remove the rule and see that the error no longer occurs. After confirming the rule has cause the issue the rule configuration will have to be reviewed and corrected. It is likely that the rule is trying to set an invalid operator or inactive operator.  

error 900-001-6, Cannot invoke "com.successfactors.user.bean.UserBean.getUserId()" because "user" is null , KBA , LOD-SF-RCM-JOB , Job Postings & Requisitions , Problem