Deactivate WordPress Dashboard for Vendors
By default Vendors will be redirected to their BuddyPress 'Member Profile Vendor Dashboard' if they try to access the back-end ( /wp-admin ). All other roles will be able to access the wp admin. In the WC Vendor Pro settings you can set WordPress dashboard to "only administrators can access the /wp-admin/ dashboard".
Turn off the redirect and enable admin back-end access
Vendor Store Settings
You can redirect the Vendor Store to the BuddyPress Vendor Profile