Hi guys! I really need your piece of advice.
Lets take an example:
I have an order with great number of items with given net value.
Item1: 1 308,15
Item2: 130,82
Item3: 2 616,32
Item4: 130,81
Item5: 1 308,15
Item6: 654,08
When I want to execute billing of such a document, SAP calculates tax per item(for example 10%):
Item1: 1 308,15
TAX calculated value: 130,82
Item2: 130,82
TAX calculated value: 13,08
Item3: 2 616,32
TAX calculated value: 261,63
Item4: 130,81
TAX calculated value: 13,08
Item5: 1 308,15
TAX calculated value: 130,82
Item6: 654,08
TAX calculated value: 65,41
Sum: 6148,33 TAX: 614,84
If we calculate total tax per document: 6148,33 * 10% = 614,83
We have 0,01 discepancy for document with 6 items, for document with hundred intems this discrepancy will be huge.
Do you have any idea how to fix it?
I hope my description is fine however I am just an abaper 
Thanks for your help,
Adam Tomaszewski