Limit rows on Top 5 ranking

Hi

I'm on BusinessObjects Webi 4.1 SP4, and want to ask if it is possible to limit the number of rows to show when ranking are the same.  For example, this is the dataset:

Material        Quantity Sold

Material1             30

Material2             25

Material3             25

Material4             25

Material5             25

Material6             25

Material7             25

Material8             25

Material9             15

I want to get the results to show Top 5 :

Material        Quantity Sold

Material1             30

Material2             25

Material3             25

Material4             25

Material5             25

(I honestly don't care which items are selected displayed between "Material2" to "Material 8", as long as there are 5 rows)

Right now my Webi report is showing the following with the Top 5 Ranking:

Material        Quantity Sold

Material1             30

Material2             25

Material3             25

Material4             25

Material5             25

Material6             25

Material7             25

Material8             25

Would appreciate any thoughts and suggestions, thanks!