Hi Sonia,
"Use precalculated value" is used when we want to do the calculation in item level. For example consider such a data:
Document fs_item_1 fs_item_2
A1 -1 3
A2 3 8
A3 -3 7
when you use this option it calculates as:
Document fs_item_1 fs_item_2 KYF
A1 -1 3 2
A2 3 8 8
A3 -3 7 4
SUM -1 18 14
If you don't use the option you will get the formula result acording to sum and see as:
Document fs_item_1 fs_item_2 KYF
A1 -1 3 2
A2 3 8 8
A3 -3 7 4
SUM -1 18 17
Please fs_item_1 and fs_item_2 visible in your query . When you run the query see how the formula behaves. Maybe for that account fs_items have values of 0, if you have suppressed zeros, then you don't see that account.
Hope it gives an idea.
Yasemin...