Add missing whatsapp_web_id field to res.partner

models/__init__.py

@@ -4,3 +4,4 @@ from . import whatsapp_composer
 from . import whatsapp_patch
 from . import mail_message
 from . import discuss_channel
+from . import res_partner

models/res_partner.py

@@ -0,0 +1,7 @@
+from odoo import fields, models
+
+
+class ResPartner(models.Model):
+    _inherit = "res.partner"
+
+    whatsapp_web_id = fields.Char(string="WhatsApp Web ID", index=True)