Hi Yunbin, I think the above logic provided is incorrect.
Let me try to explain the logic for you.
Please take a look at the SAP Note 84356.
It describes how tax is calculated in the case of several tax-relevant lines.
First, calculation of tax and tax base amount as described in Note 80977.
1. System takes the gross amount as base amount and considers it as a net amount. Auxiliary base amount: RMB 150
2. It calculates the new gross amount (tax rounded according to rounding rule)
Auxiliary gross amount: RMB 150* 1.08 = RMB 162
3. It interpolates straight-line what the base amount would be for the original gross amount of RMB 162 .
A commercial rounding is always made here as it is correct during an interpolation.
Aux. base amount: RMB 150*150/162 = 138.8888888888889 = 139
4. Tax calculation from the base amount (tax rounded according to rounding rule) base amount * tax rate = tax
Tax: RMB 139 * 0.08 = 139*0.08 = 11.12 = 11 RMB
Line 1 tax = 10* 11/150= 1 RMB
Line 2 tax = 20* 11/150 = 1 RMB
Line 3 tax = 40* 11/150 = 3 RMB
Line 4 tax = 80* 11/150 = 6 RMB
Line 1 base amount = 10-1 = 9
Line 2 base amount = 20-1 = 19
Line 3 base amount = 40-3= 37
Line 4 base amount = 80-6= 74
So you got the following postings
40 86120101 9
40 86120101 19
40 86120101 37
40 86120101 74
50 11110101 150
40 TAX 13910101 11
Best Regards Zidane
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