chore: allow updating maximum_limit_amount

lending/loan_management/doctype/loan/loan.json

@@ -528,6 +528,7 @@
    "label": "Limit Applicable End"
   },
   {
+   "allow_on_submit": 1,
    "fieldname": "maximum_limit_amount",
    "fieldtype": "Currency",
    "label": "Maximum Limit Amount"
@@ -540,6 +541,7 @@
    "options": "Loan Category"
   },
   {
+   "allow_on_submit": 1,
    "fieldname": "available_limit_amount",
    "fieldtype": "Currency",
    "label": "Available Limit Amount",
@@ -555,7 +557,7 @@
  "index_web_pages_for_search": 1,
  "is_submittable": 1,
  "links": [],
- "modified": "2023-11-30 20:01:08.861608",
+ "modified": "2023-12-01 15:51:08.809933",
  "modified_by": "Administrator",
  "module": "Loan Management",
  "name": "Loan",

lending/loan_management/doctype/loan/loan.py

@@ -144,6 +144,17 @@ def on_update_after_submit(self):
 			applicant_type=self.applicant_type, applicant=self.applicant, reverse=not self.manual_npa
 		)
 
+	def before_update_after_submit(self):
+		self.update_available_limit_amount()
+
+	def update_available_limit_amount(self):
+		if self.maximum_limit_amount < self.utilized_limit_amount:
+			frappe.throw(_("New maximum limit amount cannot be lesser than the utilized limit amount"))
+
+		self.available_limit_amount += self.maximum_limit_amount - frappe.db.get_value(
+			"Loan", self.name, "maximum_limit_amount"
+		)
+
 	def set_missing_fields(self):
 		if not self.company:
 			self.company = erpnext.get_default_company()