Fix Odoo 17 VAT Reporting

Our production Odoo 17 Enterprise instance on AWS suddenly delivers an empty Spanish VAT report after years of trouble-free operation with the OCA localization modules. The accounting entries exist, yet the report retrieves nothing.

I need someone fluent in Python, Odoo framework internals, and the Spanish OCA tax addons to:

• trace why the VAT report returns no lines,
• inspect tax mappings, fiscal positions, and journal settings for inconsistencies,
• patch or re-configure the Spanish OCA modules so the report shows correct figures,
• validate that other tax reports still behave, and
• leave me with a short note on what broke and how to avoid it next time.

Please plan to work directly on the live environment (we can clone to a staging branch first if you prefer) and keep downtime to a minimum. Solid, well-commented code or configuration changes and a concise hand-off summary will mark the task complete. Successful collaboration here could turn into ongoing maintenance work.