Support splitting of Sales tax amounts into the split Customer payment fee amounts

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Currently, when users split the Payment Fee amounts into multiple lines (to match the specific no. of Item/Product lines [as well as their specific GST/Sales tax requirements] from the Sales order/SO invoice that the payment is settled against), the payment fee (with Sales tax) posting in customer payment voucher is wrong.

In other words, when posting a Customer payment journal with multiple Payment fee lines (having GST/Sales tax calculated on each Payment fee line), it adds up all the GST/Sales tax amounts into only one of the Payment fee amounts.

Example scenario:

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ACTUAL RESULTS:

Fee #1 = 11.70

Sales tax on Fee #1 = 1.17

Fee #2 = 8.00

Sales tax on Fee #2 = 0.80

Customer payment account (Main) = 975.70

Customer payment account (Fee #2) = -8.00

Customer payment account (Fee #1) =-13.67 (from 11.70 + 1.17 + 0.80)

AR account = -975.70

EXPECTED RESULTS:

Fee #1 = 11.70

Sales tax on Fee #1 = 1.17

Fee #2 = 8.00

Sales tax on Fee #2 = 0.80

Customer payment account (Main) = 975.70

Customer payment account (Fee #2) = -8.80 (from 8.00 + 0.80)

Customer payment account (Fee #1) =-12.87 (from 11.70 + 1.17)

AR account = -975.70