I am sitting and watching Batman:Mystery of the Batwoman for the twenth time with my boys at the moment. And I been meaning to track this done and find out when this devolped.

In the beginning of the movie Barbara and Bruce had a brief phone converstion,

It was implied that they had either startted a relationship/flirtation with each other. But my question is: Was this a one time character devolpment, or was there a exchange that happened in another story and if so which one?

It was never fully stated in the animated series, however, in Batman Beyond, Barbara did mention that she and Bruce went out for a brief period.

ok, that makes some sense, I do recall that being mentioned in Batman Beyond. I am pretty decent with the Animated series continuity and never heard mention of it earlier in the run.

Good Info my friend