diff --git a/erpnext/manufacturing/doctype/operation/operation.json b/erpnext/manufacturing/doctype/operation/operation.json
index 753552ce54e..65daa03a76b 100644
--- a/erpnext/manufacturing/doctype/operation/operation.json
+++ b/erpnext/manufacturing/doctype/operation/operation.json
@@ -70,7 +70,8 @@
    "fieldname": "batch_size",
    "fieldtype": "Int",
    "label": "Batch Size",
-   "mandatory_depends_on": "create_job_card_based_on_batch_size"
+   "mandatory_depends_on": "create_job_card_based_on_batch_size",
+   "non_negative": 1
   },
   {
    "default": "0",
@@ -104,7 +105,7 @@
  "icon": "fa fa-wrench",
  "index_web_pages_for_search": 1,
  "links": [],
- "modified": "2021-11-24 19:15:24.357187",
+ "modified": "2025-08-04 16:14:57.659318",
  "modified_by": "Administrator",
  "module": "Manufacturing",
  "name": "Operation",
@@ -137,4 +138,4 @@
  "sort_field": "modified",
  "sort_order": "DESC",
  "track_changes": 1
-}
\ No newline at end of file
+}
diff --git a/erpnext/manufacturing/doctype/sub_operation/sub_operation.json b/erpnext/manufacturing/doctype/sub_operation/sub_operation.json
index 10cee32398a..c7530e41aca 100644
--- a/erpnext/manufacturing/doctype/sub_operation/sub_operation.json
+++ b/erpnext/manufacturing/doctype/sub_operation/sub_operation.json
@@ -24,7 +24,8 @@
    "fieldname": "time_in_mins",
    "fieldtype": "Float",
    "in_list_view": 1,
-   "label": "Operation Time"
+   "label": "Operation Time",
+   "non_negative": 1
   },
   {
    "fieldname": "column_break_5",
@@ -39,7 +40,7 @@
  "index_web_pages_for_search": 1,
  "istable": 1,
  "links": [],
- "modified": "2021-07-15 16:39:41.635362",
+ "modified": "2025-08-04 16:15:11.425349",
  "modified_by": "Administrator",
  "module": "Manufacturing",
  "name": "Sub Operation",
@@ -49,4 +50,4 @@
  "sort_field": "modified",
  "sort_order": "DESC",
  "track_changes": 1
-}
\ No newline at end of file
+}