Question About Units that 'Enter' Map

[Victor Louie]

A scenario specifies that a unit ENTERS on hex 'X' or hex row X'.

Does that mean a unit can be placed in the hex (therefore said to be 'entering'), and then immediately use its first impulse to fire once its placed in its starting hex?

Or, must a unit first use an impulse to move onto the map, and only thereafter in following turns, use an impulse to fire?

 

[Barthheart]

Units entering must use an impulse and count the first hex entered against their movement points.