diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index 93adfb1fab7..a899ddcc5a7 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -1133,7 +1133,7 @@ class AccountMove(models.Model):
 
                 kwargs = {
                     'base_lines': base_line_values_list,
-                    'currency': move.currency_id,
+                    'currency': move.currency_id or move.journal_id.currency_id or move.journal_id.company_id.currency_id,
                 }
 
                 if move.id:
diff --git a/addons/purchase/models/purchase.py b/addons/purchase/models/purchase.py
index e1468fc3ba0..6122f85b035 100644
--- a/addons/purchase/models/purchase.py
+++ b/addons/purchase/models/purchase.py
@@ -194,7 +194,7 @@ class PurchaseOrder(models.Model):
             order_lines = order.order_line.filtered(lambda x: not x.display_type)
             order.tax_totals = self.env['account.tax']._prepare_tax_totals(
                 [x._convert_to_tax_base_line_dict() for x in order_lines],
-                order.currency_id,
+                order.currency_id or order.company_id.currency_id,
             )
 
     @api.depends('company_id.account_fiscal_country_id', 'fiscal_position_id.country_id', 'fiscal_position_id.foreign_vat')