A family of Microsoft relational database management systems designed for ease of use.
I don't think Luis was asking about shapes on a background page. But regardless, the formula I posted will still work on background pages, e.g.,
=SHAPETEXT(Pages[Background-1]!Sheet.1!TheText)
However, you are trying to replicate shape data properties not text on a shape so there is no "sheet" name required. I think what you want is something like this:
=Pages[Background-1]!ThePage!Prop.MyPropertyName
The formula still has the same three elements:
page ! object ! property
In the original formula the elements were
page ! shape ! text
In your formula you need
page ! pagesheet ! shape data value