Drag and drop same obs data on chart duplicates mapping

[msevestre]

I believe this is NOT by design
Using project from #800

IMO, obs data should only be added once to the list

Thoughts? @rwmcintosh @Yuri05 @PavelBal @georgeDaskalakis ?

[Yuri05]

obs data should only be added once to the list

Yes!

[PavelBal]

obs data should only be added once to the list

Hmm... In PI we are (finally!) allowed to map the same obs data to multiple simulations outputs. I would say it should also be possible in the simulations. However, multiple mapping of the same data to the same simulation output makes no sense. So:

1. Mapping the same observed data to multiple outputs: YES
2. Mapping multiple observed data to the same output: YES
3. Duplicated mappings: NO.

[msevestre]

Mapping the same observed data to multiple outputs: YES

Within ONE Simulation? Why does it make sense?

[PavelBal]

It makes sense in some cases but is not worth the effort... So we can agree that obs data should be added only once.