diff --git a/sf_manufacturing/models/mrp_workcenter.py b/sf_manufacturing/models/mrp_workcenter.py
index 9434651c..e18472d7 100644
--- a/sf_manufacturing/models/mrp_workcenter.py
+++ b/sf_manufacturing/models/mrp_workcenter.py
@@ -256,14 +256,12 @@ class ResWorkcenter(models.Model):
                                                                   date_planned_end),
                                                                  ('state', 'not in', ['draft', 'cancel'])])
 
-        if plan_ids:
-            sum_qty = sum([p.product_qty for p in plan_ids])
-            production_line_hour_capacity = self.production_line_hour_capacity
-            if sum_qty >= production_line_hour_capacity:
-                message = '当前计划开始时间不能预约排程,超过生产线小时产能(%d件)%d件' % (
-                    production_line_hour_capacity, count)
-                raise UserError(message)
-                return False
+        sum_qty = sum([p.product_qty for p in plan_ids]) if plan_ids else count
+        production_line_hour_capacity = self.production_line_hour_capacity
+        if sum_qty > production_line_hour_capacity:
+            message = '当前计划开始时间不能预约排程,超过生产线小时产能(%d件)%d件' % (
+                production_line_hour_capacity, count)
+            raise UserError(message)
         return True