Hi Roeland Vandecan,

Based on my R&D

Found this field in (account.move) model

use in compute total amount.

1. amount_untaxed:
   • Represents the untaxed amount without considering whether it's a debit or credit.
   • This field typically holds the absolute value of the untaxed amount, regardless of whether it's positive (debit) or negative (credit).
2. amount_untaxed_signed:
   • Represents the untaxed amount with its sign preserved.
   • If the untaxed amount is positive (debit), it's stored as a positive value. If it's negative (credit), it's stored as a negative value.
3. amount_tax:
   • Represents the tax amount without considering whether it's a debit or credit.
   • Similar to amount_untaxed, this field typically holds the absolute value of the tax amount, regardless of its direction.
4. amount_tax_signed:
   • Represents the tax amount with its sign preserved.
   • If the tax amount is positive (debit), it's stored as a positive value. If it's negative (credit), it's stored as a negative value.

The purpose of maintaining both signed and unsigned versions of these fields is to provide flexibility for various accounting operations and reporting requirements. 

• Unsigned amounts (amount_untaxed and amount_tax) are useful for calculating totals, performing arithmetic operations, and ensuring consistency in financial calculations.
• Signed amounts (amount_untaxed_signed and amount_tax_signed) are valuable for reporting and analysis purposes, as they reflect the nature of the transaction (debit or credit) and help in preparing accurate financial statements.

Thanks