The spreadsheet contains more formulas than are supported..

Recently bought Numbers for the iPad. After attempting to import an Excel spreadsheet unsuccessfully (error message that said something about unsupported formulas) I simplified the spreadsheet and thought I would add the formulas back inside of Numbers.

It imported successfully and then I proceeded to add formulas. After nearly completing it I ran into this message "The spreadsheet contains more formulas than are supported." while attempting to fill cells with a formula.

The spreadsheet is large, 7700 rows and 8 columns, but not huge by spreadsheet standards. Can this be true, Numbers is a tease?

Rick