This is the formula:
SUMIFS(INDIRECT($C$21),Sales_Per,B24,Product,$C$19,Period,$C$20)
This formula is coming form the first sheet(CH1) of dynamic dashboard in chandoo's blog. When there is no value, the cell shows: - but that is only the format when you click on the cell, you see that there is a formula.
Thank you very much for your help.
Guity