Between-prompt: Exception: DBD, ORA-00905: missing keyword (DA0005)

I would like to add a "Between... and" prompt in one of our BO XI R2 reports; however, when I run the report I get the following error message:

(DA0005)
Exception: DBD, ORA-00905: missing keyword

I selected the correct object, it's a "number" type in the universe...

Thanks!