Odoo module upgrades, done for you
Field does not exist — your module extends a model Odoo changed
Tracebacks like Field '…' does not exist or view errors on a core field mean your module still targets an old model shape. Odoo removes and renames fields on account.move, stock.picking, sale.order, and others between versions.
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Common questions
Why do core model fields disappear on upgrade?
Odoo refactors core models between major versions. Custom modules that inherit or xpath into those models need updating to match the new schema.