Rounding Difference Exists in AR

Hello, I have the following scenario:

the client imports from a system called Gescom the transactions, to Oracle AR like the following:

(Tax rate = 20%)

Current System calculation:

line 1: 1.89 * 0.02 = 2.26

line 2: 35.2 * 0.2 = 42.24

Total Amount with Tax = 44.5

Explanation of the desired calculation:

1) The sum of all lines = 1.89 + 35.2 = 37.09

2) The sum of all lines * tax percentage = 37.09 * 20% = 7.42

3) Total Amount with Tax = 37.09 + 7.42 = 44.51

How can we reach the desired calculation?

Thank you