Best place to use DEQUEUE in web dynpro?

Hiya,

I have a popup where the user's change a Z table.

So in the popup i get all the relevant data and then enqueue the Z table so that two users don't change the same data.

Now when the users close the pop-up I'd like the DEQUEUE function modules to be used to release all the locks.

This led me to think where in web dynpro would be the best place to add the DEQUEUE?

Which of these methods would be the last to be called in a web dynpro:

Or am I thinking about this all wrong.

Shoul I do the enqueue in the popup but the DEQUEUE in the dynpro that calls the popup?

If so how would I pass across to the calling program the details of which entries I have enqued in the popup?

Any ideas would be appreciated.

Thanks!