feat - Refactor tax calculation logic in invoice payload to handle identical items

[maniamartial]

• Overview:
  This commit refactors the tax calculation logic within the build_invoice_payload function to improve the handling of taxation types. The new approach aggregates taxable amounts, tax rates, and net totals for identical items on a sales invoice.

• Changes Made:

  • Implemented a dictionary-based approach to store tax information for different taxation types (A, B, C, D, E), ensuring accurate calculations even when multiple identical items are present in the invoice.
  • Adjusted the calculation logic to dynamically aggregate the taxable amounts and tax rates based on the taxation type, which resolves issues related to incorrect totals when identical items are invoiced.
  • Enhanced the payload structure to utilize the newly calculated tax data directly from the aggregated results, improving the overall integrity of the invoice payload.

• Benefits:

  • The new method simplifies the code by consolidating tax calculations and improving maintainability.
  • This change enhances the accuracy of tax reporting and compliance with regulations by ensuring that identical items are correctly accounted for in the tax calculations.
  • The improvements also contribute to better performance when processing invoices with multiple identical items, as calculations are more efficient.

• Next Steps:

  • Testing will be conducted to ensure that the refactored logic works as expected across various invoice scenarios.
  • Further refinements may be implemented based on feedback and any edge cases identified during testing.

[maniamartial]

Did the same changes to purchase invoice.