It appeared from your other thread you may have figured out what was going on. You did mention however adding a project to a project and I am sure you meant adding a project to a solution.
good luck if you got it figured out.
Tim

>Unfortunately, I can not include projects into this project
>
>I get
>
>---------------------------
>Microsoft Visual Studio
>---------------------------
>A reference to 'SDC.Business' could not be added. Adding a reference to a desktop project from a smart device project is not supported.
>---------------------------
>OK
>---------------------------
>
>The error message itself is seems to be reversed. Also, could it be because I added these new objects (Business, DataSets) later in the game?
>
>Thanks in advance.