Bug:
Currently, creating an intra-community bill and reconciling it with an
early payment can break the tax report.
Steps to reproduce:
1. install the Austrian localization (l10n_at)
2. set `Cash Discount Tax Reduction` to `On early payment`
3. create a €1000 intra-community bill (you can just use the tax called
`IGE 20%`)
4. set the payment term to`2/7 Net 30` and confirm
5. reconcile the bill with a payment within the discount period
(2% discount: €980).
6. check the Tax Report: line 5.4 of the report should be €196. If you
reconciled the bill with a back statement directly, sections
`Innergemeinschaftliche Erwerb` and `Bemessungsgrundlage` will be
wrong as well.
Cause:
Since the intra-community applies here, the bill will produce two tax
lines. And because `Cash Discount Tax Reduction` is set to `On early
payment`, those two tax lines will be reduced when an early payment is
made.
However, because of the way the `is_refund` property of
`account.move.line` field is computed on moves of type `entry`, one of
those *tax reduction line* will be considered a refund and the other
will not. Furthermore, the computed tags are correct only because the taxes
are recomputed again when creating the payment.
After removing this extra taxes computation, both tax_tag_ids/tax_tag_invert
are invalid.
So the solution is to fix the method computing the taxes for cash discount lines.
Note: This commit also fixes the cash discount engine not working with multiple tax repartition lines since:
https://github.com/odoo/odoo/commit/9c134ec379819053e3fdd1e252e3a7ae8a949f42
opw-3112197
Enterprise PR: odoo/enterprise#39181closesodoo/odoo#118588
X-original-commit: de0db2429f7c47d52c1bad37b9d35d425c8d5b74
Related: odoo/enterprise#39775
Signed-off-by: Laurent Smet <las@odoo.com>
Signed-off-by: Nshimiyimana Serge Séna (sesn) <sesn@odoo.com>
Co-authored-by: Laurent Smet <las@odoo.com>
