business objects operator "????"

I noticed that someone searched for these terms.

This is probably going to be short and sweet:

business objects operator "????"


Whenever you find ???? inside a variable, it simply means that the object that was used 

to create this particular variable, is no longer in the query.

Let's say that you create a variable Year. And you use the following formula:

=year([Sales date])

and then, remove the object [Sales date] from your query.

The object Year will then contain =year(????)

Not good :)

Cheers