fix: Update state code and union territory for Daman and Diu (#22988)

Co-authored-by: Rucha Mahabal <ruchamahabal2@gmail.com>

erpnext/patches.txt

@@ -719,3 +719,4 @@ erpnext.patches.v12_0.update_item_tax_template_company
 erpnext.patches.v13_0.move_branch_code_to_bank_account
 erpnext.patches.v13_0.healthcare_lab_module_rename_doctypes
 erpnext.patches.v13_0.stock_entry_enhancements
+erpnext.patches.v12_0.update_state_code_for_daman_and_diu

erpnext/patches/v12_0/update_state_code_for_daman_and_diu.py

@@ -0,0 +1,22 @@
+import frappe
+from erpnext.regional.india import states
+
+def execute():
+
+	company = frappe.get_all('Company', filters = {'country': 'India'})
+	if not company:
+		return
+
+	# Update options in gst_state custom field
+	gst_state = frappe.get_doc('Custom Field', 'Address-gst_state')
+	gst_state.options = '\n'.join(states)
+	gst_state.save()
+
+	# Update gst_state and state code in existing address
+	frappe.db.sql("""
+		UPDATE `tabAddress`
+		SET
+			gst_state = 'Dadra and Nagar Haveli and Daman and Diu',
+			gst_state_number = 26
+		WHERE gst_state = 'Daman and Diu'
+	""")

erpnext/regional/india/__init__.py

@@ -10,8 +10,7 @@ states = [
  'Bihar',
  'Chandigarh',
  'Chhattisgarh',
- 'Dadra and Nagar Haveli',
- 'Daman and Diu',
+ 'Dadra and Nagar Haveli and Daman and Diu',
  'Delhi',
  'Goa',
  'Gujarat',
@@ -50,8 +49,7 @@ state_numbers = {
  "Bihar": "10",
  "Chandigarh": "04",
  "Chhattisgarh": "22",
- "Dadra and Nagar Haveli": "26",
- "Daman and Diu": "25",
+ "Dadra and Nagar Haveli and Daman and Diu": "26",
  "Delhi": "07",
  "Goa": "30",
  "Gujarat": "24",

erpnext/regional/india/gst_state_code_data.json

@@ -134,15 +134,10 @@
   "state_code": "DL",
   "state_name": "Delhi"
  },
- {
-  "state_number": "25",
-  "state_code": "DD",
-  "state_name": "Daman and Diu"
- },
  {
   "state_number": "26",
   "state_code": "DN",
-  "state_name": "Dadra and Nagar Haveli"
+  "state_name": "Dadra and Nagar Haveli and Daman and Diu"
  },
  {
   "state_number": "22",