I have a package using child packages. I make them name dependant using an
ActiveX Task. I browse through all Execute Package Tasks and set the
PackageID to a global variable I called lc_NULL (which I left empty).

Now once in a while I get a "Error converting data type varchar to
uniqueidentifier".
This error pops when I try to execute a "Execute Package" Task or when I try
to see its inner global variables. Really annoying...

To fix this I set the lc_NULL to another value, exit the screen, go back
again and change it back to empty.

Is it a bug or am I missing something really simple?

Thanks