Yes...but the common (and legal) principal here is you buy a BA ticket/product with BA flight number from BA where under normal circumstances that flight on BA would provide a certain level of service/product i.e. a meal - and then you go on a One World 'PARTNER' note the term - and you dont get that product you have paid for...trade descriptions et al?!
So much for a seamless alliance and standardised service across that alliance which when first vaunted (particularly with One World in the early days when like other alliances this aspect was very defined) many moons ago was what these alliances were aiming for - and as an example US Air was dumped from a pre One World era alliance with BA as BA believed the US Air service and product could not match its own and its customers aspirations...and now with 'One World' it doesnt matter apparently
Aeroflot similarly has struggled for nearly 6 years to achieve a level of service and product to enable them to join the Skyteam alliance - the standards of joining having been set across the board by Skyteam (Air France Management)