Pivot Table Error MEssage

[Guest]

I have a worksheet with approximately 44,000 lines. When I attempt to use a
pivot table I get the following error message:

A field in your source data has more unique items than can be used in a
Pivot Table.


I have never had this error message before. What does it mean and how do I
fix it?

Thanks.

 

[robert111]

I SUSPECT YOU HAVE EXCEEDED A PRE SET LIMIT. Can you change to a
sumproduct table?