Sansan

The following error occurred. "Error code: INVALID_OR_NULL_FOR_RESTRICTED_PICKLIST"

 From the following screen in Salesforce, remove the check from "Strictly apply selected list values" and then save.
Go from either "Setup", "Customize", "Contacts" or "Leads", "Fields", "Tags", "Edit".
* For more details, please contact your provider of Salesforce. salesforce.com help portal