Custom modules or integrations need a change.
The SCSS that kept fa-* and oi-* classes working was removed when the web client switched to Material Symbols. The new upgrade_code script rewrites icon usages in XML, JS and other files of custom modules. Run it on your addons before upgrading to 20.0.
Mentioned in: What's new in Odoo 20, Odoo 20 is released
Depending on the PostgreSQL version, foreign key violations can be raised as RESTRICT violations. The ORM now treats both the same way, and custom code catching only ForeignKeyViolation should do the same.
Mentioned in: What's new in Odoo 20
Behaviour changes worth knowing. Usually nothing to do.
Warnings about unsupported domain values, such as NewId or records, and about upper-case operators now name the code that built the domain. Run your test suite and outdated patterns in custom modules are easy to find.
Mentioned in: What's new in Odoo 20
What changes for people working in Odoo, by app.
Analytic distributions that still referenced deleted accounts are now cleaned before they are merged with new values.
The new pos_sumup module pairs SumUp readers and handles payments, cancellations and full or partial refunds through SumUp's cloud API. It is a backport from master.
Mentioned in: What's new in Odoo 20, Point of Sale adds SumUp payment terminals
When several terminals share a provider, for example five Adyen readers, each device can pick its default. The payment screen then shows one button per provider instead of every terminal.
Mentioned in: What's new in Odoo 20
The cash drawer can now be opened from the opening control popup to count the till.
The first shared stage is searched once when computing lead probabilities. The helper keeps its signature for custom overrides.
/my/tasks served avatars as base64, which could be several MB and could not be cached. It now uses /web/image URLs with an access token.
The OdooBot check no longer counts partners on every call, and res.partner.email_normalized gets an index. Before, this was a full table scan once per invoice in the send wizard.
On the employee kanban of odoo.com, requests dropped from 181 to 156.
Slovak invoices can carry the PAY by square QR code, which Slovak banking apps read, instead of the EPC SEPA code most of them ignore.
Bookkeepers can now mark an e-invoice that was cancelled on GİB or Nilvera as cancelled in Odoo. Odoo does not report the cancellation to the authorities.
Framework, tooling and code-level changes.
Links in read-only HTML that open in a new tab now get rel="noreferrer noopener".
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