Orders regarding disposal of bomb loads

[CornwallPhil]

I have come across an entry in a UK Regiment War Diary that states:
"5 April 1941 0119 2 HEs dropped on the foreshore Falmouth Bay. No casualties. Slight damage to windows. Aircraft returning from North crossed coast near Lizard, returned and released bombs passing over Docks. Probable objective - Docks."

My question is this: Were Luftwaffe crews issued with specific instructions as to where they should 'dump' their bombs before returning home or was this just an opportunistic event done on the initiative of this particular crew? The fact they passed well south of Falmouth, turned to come and drop their bombs there, before proceeding home shows it was a deliberate and chosen act but this doesn't appear to be a secondary target as from what I can gather the main raid at the time was on Coventry and I would have thought secondary targets would have been in the Midlands.

I'd be grateful for any enlightenment.