diff --git a/frappe/custom/doctype/custom_field/custom_field.json b/frappe/custom/doctype/custom_field/custom_field.json
index aba6e4be1f..ec132dd019 100644
--- a/frappe/custom/doctype/custom_field/custom_field.json
+++ b/frappe/custom/doctype/custom_field/custom_field.json
@@ -48,6 +48,7 @@
   "print_width",
   "alignment",
   "no_copy",
+  "set_only_once",
   "allow_on_submit",
   "in_list_view",
   "in_standard_filter",
@@ -484,6 +485,12 @@
    "fieldtype": "Select",
    "label": "Button Color",
    "options": "\nDefault\nPrimary\nInfo\nSuccess\nWarning\nDanger"
+  },
+  {
+   "default": "0",
+   "fieldname": "set_only_once",
+   "fieldtype": "Check",
+   "label": "Set only once"
   }
  ],
  "grid_page_length": 50,
@@ -491,7 +498,7 @@
  "idx": 1,
  "index_web_pages_for_search": 1,
  "links": [],
- "modified": "2025-11-12 01:14:24.753774",
+ "modified": "2026-03-22 10:35:32.555267",
  "modified_by": "Administrator",
  "module": "Custom",
  "name": "Custom Field",
diff --git a/frappe/custom/doctype/custom_field/custom_field.py b/frappe/custom/doctype/custom_field/custom_field.py
index 1ad9b98d60..41e86656e9 100644
--- a/frappe/custom/doctype/custom_field/custom_field.py
+++ b/frappe/custom/doctype/custom_field/custom_field.py
@@ -22,9 +22,9 @@ class CustomField(Document):
 	if TYPE_CHECKING:
 		from frappe.types import DF
 
+		alignment: DF.Literal["", "Left", "Center", "Right"]
 		allow_in_quick_entry: DF.Check
 		allow_on_submit: DF.Check
-		alignment: DF.Literal["", "Left", "Center", "Right"]
 		bold: DF.Check
 		button_color: DF.Literal["", "Default", "Primary", "Info", "Success", "Warning", "Danger"]
 		collapsible: DF.Check
@@ -114,6 +114,7 @@ class CustomField(Document):
 		report_hide: DF.Check
 		reqd: DF.Check
 		search_index: DF.Check
+		set_only_once: DF.Check
 		show_dashboard: DF.Check
 		sort_options: DF.Check
 		translatable: DF.Check
diff --git a/frappe/custom/doctype/customize_form/customize_form.py b/frappe/custom/doctype/customize_form/customize_form.py
index d631faff01..472a80c6a7 100644
--- a/frappe/custom/doctype/customize_form/customize_form.py
+++ b/frappe/custom/doctype/customize_form/customize_form.py
@@ -810,6 +810,7 @@ docfield_properties = {
 	"placeholder": "Data",
 	"button_color": "Select",
 	"mask": "Check",
+	"set_only_once": "Check",
 }
 
 doctype_link_properties = {
diff --git a/frappe/custom/doctype/customize_form_field/customize_form_field.json b/frappe/custom/doctype/customize_form_field/customize_form_field.json
index 6976cbe0f9..3e658738bf 100644
--- a/frappe/custom/doctype/customize_form_field/customize_form_field.json
+++ b/frappe/custom/doctype/customize_form_field/customize_form_field.json
@@ -22,6 +22,7 @@
   "in_preview",
   "bold",
   "no_copy",
+  "set_only_once",
   "allow_in_quick_entry",
   "translatable",
   "mask",
@@ -509,6 +510,12 @@
    "fieldname": "mask",
    "fieldtype": "Check",
    "label": "Mask"
+  },
+  {
+   "default": "0",
+   "fieldname": "set_only_once",
+   "fieldtype": "Check",
+   "label": "Set only once"
   }
  ],
  "grid_page_length": 50,
@@ -516,7 +523,7 @@
  "index_web_pages_for_search": 1,
  "istable": 1,
  "links": [],
- "modified": "2025-12-23 14:17:10.458916",
+ "modified": "2026-03-22 10:36:12.968197",
  "modified_by": "Administrator",
  "module": "Custom",
  "name": "Customize Form Field",
diff --git a/frappe/custom/doctype/customize_form_field/customize_form_field.py b/frappe/custom/doctype/customize_form_field/customize_form_field.py
index fcd28b9439..bd4d46ffe7 100644
--- a/frappe/custom/doctype/customize_form_field/customize_form_field.py
+++ b/frappe/custom/doctype/customize_form_field/customize_form_field.py
@@ -13,10 +13,10 @@ class CustomizeFormField(Document):
 	if TYPE_CHECKING:
 		from frappe.types import DF
 
+		alignment: DF.Literal["", "Left", "Center", "Right"]
 		allow_bulk_edit: DF.Check
 		allow_in_quick_entry: DF.Check
 		allow_on_submit: DF.Check
-		alignment: DF.Literal["", "Left", "Center", "Right"]
 		bold: DF.Check
 		button_color: DF.Literal["", "Default", "Primary", "Info", "Success", "Warning", "Danger"]
 		collapsible: DF.Check
@@ -109,6 +109,7 @@ class CustomizeFormField(Document):
 		remember_last_selected_value: DF.Check
 		report_hide: DF.Check
 		reqd: DF.Check
+		set_only_once: DF.Check
 		show_dashboard: DF.Check
 		sort_options: DF.Check
 		translatable: DF.Check