Unable to block creation of sales document from Quotation thru user status

Dear Experts,

I have maintained a status profile in my Quotation document through the use of user status. I have defined a status to forbid creation of sales document if the status has not yet been set to "Approved".

However, even when the status is not yet "Approved", it still allows me to create subsequent sales document from this Quotation.

Anything that I have missed here?