I am looking for a highly experienced Odoo 19 specialist (SaaS, Studio) who can reliably diagnose and fix complex Studio/ORM issues. Problem (concise): When saving products, a server error occurs: ValueError: Cannot convert product.template.product_variant_id to SQL because it is not stored This error blocks changes in the Purchase tab. Environment: Odoo 19 (SaaS) Odoo Studio only (no custom modules, no server access) Model: product.template Task: Identify and fix the root cause (Studio field, related field, stored/non-stored relation, trigger, domain, view, or action) Ensure products can be saved without errors and the Purchase tab works normally No workarounds – a clean, stable solution is required Requirements (mandatory): Proven experience with Odoo 19 Studio (SaaS) Strong understanding of Odoo ORM, stored vs. non-stored fields, related fields, views & actions Ability to correctly interpret Odoo server tracebacks No beginners, no guessing, no trial-and-error Working style: Short, precise, solution-focused Clear explanation of what is changed/removed and why Fix must be tested live Please apply only if you are fully confident and have solved similar Odoo Studio issues before.