Let's see our Scalp is an anti-radiation missile which means that it will only work on warships and land vehicles that have a radar. That said, you must turn on the radar of the Rafale with the touch (i) in addition to passing the authorization to fire with ALT Z or ALT W on your keyboard, lock your target and be in the zone of the emissions of the enemy radar. The wider the radar band, the farther you can shoot with the Russian MOSKVA you can shoot your SCALP more than 100 km from your target.
I've tested the two version in my OB 2.5.6 and both are working for me .
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Regards