Hi Sachin,
The flag "All Sales Areas" that you have highlighted is used for blocking Sales Support. As we can see the flag is under "Block Sales Support" section. The flag is in relation to Create Sales Activity (VC01N) not sales order creation (VA01).
If you are not allowed to create sales order now and you want to remove this restriction, you need to adjust the value assign to "All Sales Areas" and "Selected Sales Area" under "Order Block" section.
Best regards,
Crystal Lin