fix: do not update PE title during data import (#24835)

* fix: do not update PE title during data import

Related issue: ISS-20-21-10132

* fix: make title field read only

erpnext/accounts/doctype/payment_entry/payment_entry.json

@@ -531,7 +531,8 @@
    "fieldtype": "Data",
    "hidden": 1,
    "label": "Title",
-   "print_hide": 1
+   "print_hide": 1,
+   "read_only": 1
   },
   {
    "depends_on": "party",
@@ -575,7 +576,7 @@
   }
  ],
  "is_submittable": 1,
- "modified": "2019-11-06 12:59:43.151721",
+ "modified": "2021-03-10 13:05:16.958866",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "Payment Entry",
@@ -619,4 +620,4 @@
  "sort_order": "DESC",
  "title_field": "title",
  "track_changes": 1
-}
+}

erpnext/accounts/doctype/payment_entry/payment_entry.py

@@ -441,6 +441,10 @@ class PaymentEntry(AccountsController):
 					.format(total_negative_outstanding), InvalidPaymentEntry)
 
 	def set_title(self):
+		if frappe.flags.in_import and self.title:
+			# do not set title dynamically if title exists during data import.
+			return
+
 		if self.payment_type in ("Receive", "Pay"):
 			self.title = self.party
 		else: