Enemy Padlock Bug?

[SEE]

The 'Enemy Padlock' feature is assigned to F4 but when used it locks onto the nearest Friendly. There are separate keypresses for assigning padlock onto friendlys, air and ground targets etc. Is this a bug as I would have expected the F4 padlock to ignore friendly?

(Unless it defaults to 'friendly' if the enemy are visible but out of 'Padlock Range'?)

I did a search, checked the manual but no answers - sorry for all the newbie questions.