40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
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"""Dominican invoice tax rounding policy.
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Tryton's generic taxable mixin compensates the aggregate currency-rounding
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remainder on the first non-zero tax. That keeps the rounded aggregate equal
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to the aggregate of the unrounded taxes, but it can change the reported value
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of a specific Dominican tax (ITBIS, ISC or CDT).
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Dominican fiscal documents state every tax in currency precision. Each tax
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must therefore retain its own rounded result; no residual is redistributed
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between different tax liabilities or tax credits.
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"""
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from trytond.model import fields
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from trytond.pool import PoolMeta
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def round_taxes_independently(currency, taxes):
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"""Round every tax amount without reallocating the aggregate residual."""
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if not currency:
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return
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for taxline in taxes.values():
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taxline.amount = currency.round(taxline.amount)
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class IndependentTaxRoundingMixin:
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__slots__ = ()
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@fields.depends('currency')
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def _round_taxes(self, taxes):
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round_taxes_independently(self.currency, taxes)
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class Invoice(IndependentTaxRoundingMixin, metaclass=PoolMeta):
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__name__ = 'account.invoice'
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class InvoiceLine(IndependentTaxRoundingMixin, metaclass=PoolMeta):
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__name__ = 'account.invoice.line'
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