Hey TRM,

Okay, you're encountering a common issue in Odoo where an invoice still shows an amount due even after you've created a payment. Here's a breakdown of the possible reasons and how to troubleshoot them, specifically considering you're using the Mexico localization in Odoo 18:

1. Reconciliation Issues (Most Common):

• The Payment is Not Reconciled with the Invoice: This is the most frequent cause. In Odoo, simply creating a payment doesn't automatically link it to the invoice. You need to reconcile the payment with the invoice.
  • How to Reconcile:
    1. Go to Accounting > Customers > Payments: Find the payment you created.
    2. Click on the Payment: Open the payment record.
    3. "Outstanding Credits" or "Outstanding Payments" Banner: You should see a banner at the top of the payment form that says "Outstanding Credits" or "Outstanding Payments" (depending on whether it's a customer or vendor payment).
    4. Click the Banner: Click on the banner. This will open a list of outstanding invoices or bills.
    5. Select the Invoice: Select the invoice you want to reconcile the payment with.
    6. Validate/Apply: Click "Validate" or "Apply" to reconcile the payment.
• Partial Reconciliation: If the payment amount is less than the invoice amount, make sure you've fully reconciled the payment. Odoo might only partially reconcile the payment if there's a difference.

2. Payment Date Issues:

• Payment Date After Invoice Date: If the payment date is significantly after the invoice date, it might cause issues with reporting and aging. While it shouldn't prevent reconciliation, it's good to check.

3. Journal Issues:

• Incorrect Journal: Ensure that the payment was created in the correct journal (e.g., a bank journal or cash journal).
• Journal Configuration: Verify that the journal is configured correctly for payments and reconciliations.

4. Currency Issues (Less Likely in Mexico):

• Currency Mismatch: If you're using multiple currencies, make sure the payment and invoice are in the same currency.

5. Localization Issues (Mexico Specific):

• CFDI (Comprobante Fiscal Digital por Internet) Issues: In Mexico, invoices and payments must be properly linked with CFDI (digital tax receipts). If the CFDI information is missing or incorrect, it can cause reconciliation problems.
  • Check CFDI Status: Verify that the CFDI for both the invoice and the payment are valid and properly generated.
  • PAC (Proveedor Autorizado de Certificación) Integration: Ensure that your integration with your PAC (the authorized certification provider) is working correctly.
• SAT (Servicio de Administración Tributaria) Compliance: Make sure your accounting practices comply with the requirements of the SAT (the Mexican tax authority).

6. Odoo Version Issues (Less Likely):

• Bugs: While less likely, there's a small chance that you've encountered a bug in Odoo 18. Check the Odoo forums and bug trackers to see if anyone else has reported a similar issue.

Troubleshooting Steps:

1. Check Reconciliation First: This is the most likely cause. Follow the steps above to reconcile the payment with the invoice.
2. Review Journal Entries: Go to Accounting > Journal Entries and review the journal entries for both the invoice and the payment. Make sure they are balanced and correctly linked.
3. Verify CFDI Information (Mexico): Check the CFDI status for both the invoice and the payment.
4. Test with a New Invoice and Payment: Create a new, simple invoice and payment to see if the issue persists. This will help you determine if the problem is specific to a particular invoice or a general issue.
5. Contact Odoo Support (If Necessary): If you've tried all of the above steps and the issue is still not resolved, contact Odoo support for assistance. Provide them with detailed information about the invoice, payment, and your troubleshooting steps.

Example Scenario:

Let's say you created a payment for an invoice, but you forgot to reconcile it. When you go to the invoice, it will still show an amount due. To fix this, you would:

1. Go to Accounting > Customers > Payments.
2. Find the payment you created.
3. Click on the "Outstanding Credits" banner.
4. Select the invoice.
5. Click "Validate" to reconcile the payment.

After reconciling the payment, the invoice should no longer show an amount due.

By following these steps and carefully checking the reconciliation, journal entries, and CFDI information (in Mexico), you should be able to resolve the issue and ensure that your invoices are properly marked as paid.

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(Need further customization? Drop a comment—I’m happy to refine the solution!)