diff --git a/l10n_br_account/models/account_move.py b/l10n_br_account/models/account_move.py
index 41cca40aba63..7f8b03c2b8e7 100644
--- a/l10n_br_account/models/account_move.py
+++ b/l10n_br_account/models/account_move.py
@@ -812,4 +812,7 @@ def import_fiscal_document(
                 line_form.fiscal_operation_id = self.fiscal_operation_id
                 line_form.fiscal_document_line_id = line
         move_form.save()
+        move = self.env["account.move"].browse(move_form.id)
+        for line in move.invoice_line_ids:
+            line.product_uom_id = line.fiscal_document_line_id.uom_id.id
         return move_form
diff --git a/l10n_br_account/models/account_move_line.py b/l10n_br_account/models/account_move_line.py
index a962e059a9a2..533529f07260 100644
--- a/l10n_br_account/models/account_move_line.py
+++ b/l10n_br_account/models/account_move_line.py
@@ -646,3 +646,8 @@ def _get_amount_credit_debit_model(
             "debit": balance > 0.0 and balance or 0.0,
             "credit": balance < 0.0 and -balance or 0.0,
         }
+
+    @api.constrains("product_uom_id")
+    def _check_product_uom_category_id(self):
+        not_imported = self.filtered(lambda line: not line._is_imported())
+        return super(AccountMoveLine, not_imported)._check_product_uom_category_id()