I think the actual issue here is that the invalid orders (bus to truck stop) are not properly marked as such in the order list. (e.g. like when the station is removed entirely)

It's perfectly reasonable to not copy invalid orders (when not sharing), and it mostly makes sense that the invalid order is copied when sharing.

You can't unshare the list as that would create an invalid order, which isn't allowed. You can delete the invalid order (which should be displayed as such), and then you can successfully unshare.

Edited title and description to expose the actual issue more (it still occurs in 1.10.2).

This happens for more than only buses vs trucks. It basically happens for everything :) Pointing a train to a train-station, connect a bus-station, remove the train-station, same issue :)

A solution is a bit more tricky than I was expecting. Initially, I was thinking doing the same as when removing stations: just make the order invalid.

But what if you remove the Bus station to place it on a new spot seconds later. All orders would already been invalidated (and they will not recover). So that is far from ideal.

Using a timeout, as with stations, is also difficult, as there is no visual feedback on that.

Guess we could mark it red or something (and postfix it with invalid?), but leave the order there? But that still leaves the copy problem, which just silently fails.

Guess we could mark it red or something (and postfix it with invalid?), but leave the order there? But that still leaves the copy problem, which just silently fails.

As long as there's some way to see that the order is invalid without overwriting the order itself with Invalid Order, I like it.

Maybe also display a warning when copying impossible orders in order to allow players to better resolve such orders? For example: "Vehicle contains invalid orders" (though there's also "Vehicle can't go to all stations").

Copying no longer silently fails with #8515, so that would open the way to just mark the order as invalid (instead of removing it). Still not sure it is the best thing to do :)

I'm having a few thoughts about order lists, that may or may not be related to the problem here:

1. there exists some feature that periodically checks order lists, and issues a news message, when things are "wrong", however, it's always been totally unclear what this actually checks.
2. there are "invalid orders" when a station is completely removed, we might want to extend that to orders that cannot be fulfilled because of incompatible stations, but where do we want to stop?
   • Vehicle is a bus, but station has no bus stop
   • Vehicle is an articulated bus, but station has no drive-through bus stop
   • Vehicle is a monorail, but station has only maglev tracks
3. if we are somehow marking entries in the order list in red for any of these reasons, how do we give a hint about what exactly is wrong? order lists are already a heavily overloaded GUI that is in dire need of untangling.

Is what I came up with for now. It complements 1), as they both now show the same information. It works for any station the vehicle is not compatible with, so all of your 2), and I think the text is clear enough to solve 3) too. Well, partially .. it is still bloated .. you can now get this:

or this:

:D

that your second screenshot is much wider than the first is proof that 3) is an actual problem :)

For reference, an order list in a competitor product that shall remain unnamed :)