Why does the link on the Siege of Dragonspear store page take me to the "General Discussion", and why is Steam able to offer a decent discount for the DLC (€1,59 currently, but will expire later today)?

If we buy SoD on Steam can we play it if we own Baldur's Gate EE on GOG, or we must have both, base game and DLC, on the same platform?

You need to have both on the same platform. If I'm correct, you can't even buy Siege of Dragonspear if you don't own the base game.

Thanks.
I assumed it is something like that.

General Discussion seems to be a default used for any game which does not have a specific forum assigned to it. This is probably just a mistake on the part of whoever set up the store page. You could try reporting it, but they'll probably insist it's correct as-is and refuse to fix it.

I think so, too - and it's not a real issue for me. I just thought SoD belonged to Baldur's Gate, and it's normally a GOG standard to keep game series together in one forum. If they want to keep SoD separate, for whatever reson, it's their decision. To protect the image of the BG games?

because Gog staff fucked up... its happens from time to time

Users are forwarded to the General Forum when the original link is broken.

Report it to the support and they will fix it.

If they don't know about it, then they won't fix it. If you'd rather keep it as an issue so you can bitch about how bad GOG is, then keep it a secret from them.

It'd be nice if they fixed it, but my experience has been that reporting issues to GOG is always a waste of time. Not once has it resulted in anything being fixed, even when the fix is easy.

fyi it has been reported

I once stumbled on exactly the same problem with another game and it got fixed right away. I suppose that experiences can differ for people.

I've had really good luck with support tickets. But I don't recall ever complaining about their store. They have mainly helped me get games working that I couldn't figure out.

Oh- there have been some times when I complained that the offline install files were out of date, and they've fixed them. (of course - full disclosure - there have been some times early in the release cycle of a new game that they've flat out refused to publish every patch for offline users.)

I don't want to "keep it as an issue", I don't "bitch about how bad GOG is", and I don't "keep it a secret from them".
Most importantly, GOG isn't "bad", rather the opposite, and I'm convinced they do decent forum monitoring, so posting on a GOG forum is not exactly useful when you want to keep something a secret from GOG.
You could argue that my two original questions were rather pointless as forum questions, because, well, what answers did I expect? To be honest, SoD has been appearing in the general category for some time, and I simply couldn't imagine that this has escaped GOG's attention for so long - but possibly it has. And the question about the price was worded badly: I was displeased that Steam gets better conditions than GOG, and should have worded my question to make this clear. Meanwhile GOG has been able to make a discount offer for SoD, too (I'm not saying because of my post :-)), not quite as good as Steam's (due to different revenue figures, I suppose), but not bad either.
As far as I'm concerned, we can end this discussion here.