User unable to promote company to Sage 300 Customer/Vendor

Hi all,

I am able to promote company as admin. However, my user unable to promote company to Sage 300 Customer/Vendor, stating that the Customer code already exists in Sage 300 Company, but the customer code does not exist yet.

My user setting: 

the Sage 300 password for the integration is correct because this user able to create quotations & orders.

So I am not sure what is is the problem.