Decoding an excel formula on sumproduct

Hello Everybody,

This is my first post in this forum and I need help with an excel formula in a worksheet. It is a 'sumproduct' but I am not able to decode which rows and columns are linked in the formula because of the 'indirect function' used. The formula is:

Sumproduct(Inventory!C$3:InventoryC7,INDIRECT(ADDRESS(FC!$A$2006)-Inventory!$A7+1,Column(FCB$4),,,"FC")):FC!B$2006)

Here sumproduct in a sheet is calculated using data from two sheets 'inventory' and 'FC'.

I would be really grateful if someone can help me in understanding which rows of 'FC' sheet are multiplied with the rows C3:C7 in the 'Inventory' sheet.

Kind regards,
Poonam