Partner Email Duplicate Warn

When you open a contact (partner) form, this module checks whether other contacts use the same email address and, if so, displays a warning banner on the form.

• The banner lists the other partners with the same email as clickable links; clicking one opens that partner's form.
• If some matching partners exist but you are not allowed to see them, the banner tells you how many and asks you to contact your administrator.
• The comparison ignores upper/lower case and surrounding spaces, and only considers partners in the same company (or shared across companies).
• Parent and child contacts of the current partner are excluded from the comparison, so a company and its own contacts are not flagged against each other.

The warning appears on the standard contact form, right after the existing tax-number warning area. It relies on two computed fields on res.partner: same_email_partner_ids (the visible duplicates) and same_email_inaccessible_count (duplicates you cannot read). The check runs automatically whenever the email or company changes. No menus, reports or scheduled actions are added; the module only extends the contact form and the res.partner model.