Prorrata de IVA

This module adds Spanish VAT prorate handling to purchases. On the company form a new "With VAT Prorate" option appears; when enabled, a "VAT Prorate" tab lets you enter dated prorate records with a percentage, a type (General or Special), an optional posting account and, for the special type, whether lines are prorated by default. The company cannot enable the option without at least one prorate record, the chart of accounts must be Spanish, and the percentage must be between 0.01 and 99.9.

On vendor bills and vendor refunds, Odoo picks the prorate record in force at the invoice date and recalculates the tax lines: the non-deductible share of VAT is moved to a separate prorate line, grouped by tax, account and analytic distribution. This happens when the bill is created, when key fields change (partner, currency, dates, prorate) and when a bill is reset to draft. With the general type all VAT lines are prorated; with the special type users tick a "Vat Prorate" column on individual invoice lines.

On taxes, a "With VAT Prorate" flag and related prorate accounts are shown for Spanish prorate taxes. A wizard, reachable from the Spanish AEAT configuration menu as "Update VAT prorate", lets accounting managers edit the company's prorate table in one screen. Prorate amounts are also taken into account in the Spanish AEAT tax reports.