diff --git a/account_banking_mandate/models/account_banking_mandate.py b/account_banking_mandate/models/account_banking_mandate.py
index 64626675a..6eea0682e 100644
--- a/account_banking_mandate/models/account_banking_mandate.py
+++ b/account_banking_mandate/models/account_banking_mandate.py
@@ -173,14 +173,16 @@ class AccountBankingMandate(models.Model):
                         % mandate.unique_mandate_reference
                     )
 
-    @api.model
-    def create(self, vals=None):
-        unique_mandate_reference = vals.get("unique_mandate_reference")
-        if not unique_mandate_reference or unique_mandate_reference == "New":
-            vals["unique_mandate_reference"] = (
-                self.env["ir.sequence"].next_by_code("account.banking.mandate") or "New"
-            )
-        return super().create(vals)
+    @api.model_create_multi
+    def create(self, vals_list):
+        for vals in vals_list:
+            unique_mandate_reference = vals.get("unique_mandate_reference")
+            if not unique_mandate_reference or unique_mandate_reference == "New":
+                vals["unique_mandate_reference"] = (
+                    self.env["ir.sequence"].next_by_code("account.banking.mandate")
+                    or "New"
+                )
+        return super().create(vals_list)
 
     @api.onchange("partner_bank_id")
     def mandate_partner_bank_change(self):
diff --git a/account_banking_mandate/models/account_move.py b/account_banking_mandate/models/account_move.py
index 8af23c772..943edc6bd 100644
--- a/account_banking_mandate/models/account_move.py
+++ b/account_banking_mandate/models/account_move.py
@@ -20,8 +20,8 @@ class AccountMove(models.Model):
         related="payment_mode_id.payment_method_id.mandate_required", readonly=True
     )
 
-    @api.model
-    def create(self, vals):
+    @api.model_create_multi
+    def create(self, vals_list):
         """Fill the mandate_id from the partner if none is provided on
         creation, using same method as upstream."""
         onchanges = {
@@ -29,16 +29,17 @@ class AccountMove(models.Model):
             "_onchange_payment_mode_id": ["mandate_id"],
         }
         for onchange_method, changed_fields in list(onchanges.items()):
-            if any(f not in vals for f in changed_fields):
-                move = self.new(vals)
-                move = move.with_company(move.company_id.id)
-                getattr(move, onchange_method)()
-                for field in changed_fields:
-                    if field not in vals and move[field]:
-                        vals[field] = move._fields[field].convert_to_write(
-                            move[field], move
-                        )
-        return super().create(vals)
+            for vals in vals_list:
+                if any(f not in vals for f in changed_fields):
+                    move = self.new(vals)
+                    move = move.with_company(move.company_id.id)
+                    getattr(move, onchange_method)()
+                    for field in changed_fields:
+                        if field not in vals and move[field]:
+                            vals[field] = move._fields[field].convert_to_write(
+                                move[field], move
+                            )
+        return super().create(vals_list)
 
     def set_mandate(self):
         if self.payment_mode_id.payment_method_id.mandate_required: