Drag and drop - conditional answers?
Hi,
I have a drag and drop exercise in which a correctly dropped source stays in target, incorrectly dropped bumps back.
I have few sources that are the same, lets say: A A B B
And 2 x two targets which take A and B but: only A if B has already been dropped, or only B if A has already been dropped.
So it looks like this:
Target 1a: A
Target 1b: B
Target 2a: A
Target 2b: B
OR:
Target 1a: B
Target 1b: A
Target 2a: B
Target 2b: A
OR:
Target 1a: B
Target 1b: A
Target 2a: A
Target 2b: B
OR:
Target 1a: A
Target 1b: B
Target 2a: B
Target 2b: A
And so on...
I hope I've managed to explain what I need 
I hoped that somebody knew how to set it up? I know how to create group sources and targets but this seems like a case for conditional drop... accept 'any' A or B unless A has been dropped then accept only any B? How to do that? Is it even possible?
Any ideas?
Cheers
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