Can I perform vlookup command on a pivot table?

[yabi100]

I perform a vlookup command on a pivot table. Results are not same as I expect. Is there any limitations for performing vlookup command on a pivot table?
And very oddly when I perform isnumber command and numbers in pivot table, the result is: FALSE.
I have to add, Isnumber returns FALSE for original table, where pivot table is base on.

 

[Peter_SSs]

Can I perform vlookup command on a pivot table?

Almost certainly 'yes' (or some other formula) but without more details and/or sample data (preferably with XL2BB) it is very hard to advise further.