refactor: better manual budget distribution ux

erpnext/accounts/doctype/budget/budget.js

@@ -49,6 +49,15 @@ frappe.ui.form.on("Budget", {
 		frm.trigger("toggle_reqd_fields");
 	},
 
+	budget_amount(frm) {
+		if (frm.doc.budget_distribution?.length) {
+			frm.doc.budget_distribution.forEach((row) => {
+				row.amount = flt((row.percent / 100) * frm.doc.budget_amount, 2);
+			});
+			frm.refresh_field("budget_distribution");
+		}
+	},
+
 	set_null_value: function (frm) {
 		if (frm.doc.budget_against == "Cost Center") {
 			frm.set_value("project", null);
@@ -85,3 +94,20 @@ frappe.ui.form.on("Budget", {
 		);
 	},
 });
+
+frappe.ui.form.on("Budget Distribution", {
+	amount(frm, cdt, cdn) {
+		let row = frappe.get_doc(cdt, cdn);
+		if (frm.doc.budget_amount) {
+			row.percent = flt((row.amount / frm.doc.budget_amount) * 100, 2);
+			frm.refresh_field("budget_distribution");
+		}
+	},
+	percent(frm, cdt, cdn) {
+		let row = frappe.get_doc(cdt, cdn);
+		if (frm.doc.budget_amount) {
+			row.amount = flt((row.percent / 100) * frm.doc.budget_amount, 2);
+			frm.refresh_field("budget_distribution");
+		}
+	},
+});

erpnext/accounts/doctype/budget/budget.json

@@ -231,6 +231,7 @@
   {
    "fieldname": "account",
    "fieldtype": "Link",
+   "in_list_view": 1,
    "label": "Account",
    "options": "Account",
    "read_only_depends_on": "eval: doc.revision_of",
@@ -258,7 +259,6 @@
    "fieldname": "budget_amount",
    "fieldtype": "Currency",
    "label": "Budget Amount",
-   "read_only_depends_on": "eval: doc.revision_of",
    "reqd": 1
   },
   {
@@ -304,7 +304,7 @@
  "index_web_pages_for_search": 1,
  "is_submittable": 1,
  "links": [],
- "modified": "2025-10-30 19:07:51.022844",
+ "modified": "2025-10-31 01:13:15.114440",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "Budget",

erpnext/accounts/doctype/budget/budget.py

@@ -160,6 +160,9 @@ class Budget(Document):
 	def before_save(self):
 		self.allocate_budget()
 
+	def on_update(self):
+		self.validate_distribution_totals()
+
 	def allocate_budget(self):
 		if self.revision_of:
 			return
@@ -183,14 +186,14 @@ class Budget(Document):
 	def should_regenerate_budget_distribution(self):
 		"""Check whether budget distribution should be recalculated."""
 		old_doc = self.get_doc_before_save() if not self.is_new() else None
-
+		if not old_doc or not self.budget_distribution:
-		if not self.budget_distribution:
 			return True
 
 		if old_doc:
 			changed_fields = [
 				"from_fiscal_year",
 				"to_fiscal_year",
+				"budget_amount",
 				"allocation_frequency",
 				"distribute_equally",
 			]
@@ -255,9 +258,28 @@ class Budget(Document):
 			row.amount = 0
 			row.percent = 0
 		else:
-			row.amount = flt(self.budget_amount * row_percent / 100, 2)
+			row.amount = flt(self.budget_amount * row_percent / 100, 3)
 			row.percent = flt(row_percent, 3)
 
+	def validate_distribution_totals(self):
+		if self.should_regenerate_budget_distribution():
+			return
+
+		total_amount = sum(d.amount for d in self.budget_distribution)
+		total_percent = sum(d.percent for d in self.budget_distribution)
+
+		if flt(abs(total_amount - self.budget_amount), 2) > 0.10:
+			frappe.throw(
+				_("Total distributed amount {0} must equal Budget Amount {1}").format(
+					flt(total_amount, 2), self.budget_amount
+				)
+			)
+
+		if round(total_percent, 2) != 100:
+			frappe.throw(
+				_("Total distribution percent must equal 100 (currently {0})").format(round(total_percent, 2))
+			)
+
 
 def validate_expense_against_budget(args, expense_amount=0):
 	args = frappe._dict(args)

erpnext/accounts/doctype/budget/test_budget.py

@@ -551,16 +551,16 @@ class TestBudget(ERPNextTestSuite):
 			budget_amount=30000,
 			budget_start_date="2025-04-01",
 			budget_end_date="2025-06-30",
-			do_not_save=True,
+			do_not_save=False,
 			submit_budget=False,
 		)
 
 		budget.budget_distribution = []
 
 		for row in [
-			{"start_date": "2025-04-01", "end_date": "2025-04-30", "amount": 10000},
+			{"start_date": "2025-04-01", "end_date": "2025-04-30", "amount": 10000, "percent": 33.33},
-			{"start_date": "2025-05-01", "end_date": "2025-05-31", "amount": 15000},
+			{"start_date": "2025-05-01", "end_date": "2025-05-31", "amount": 15000, "percent": 50.00},
-			{"start_date": "2025-06-01", "end_date": "2025-06-30", "amount": 5000},
+			{"start_date": "2025-06-01", "end_date": "2025-06-30", "amount": 5000, "percent": 16.67},
 		]:
 			budget.append("budget_distribution", row)
 
@@ -608,10 +608,10 @@ class TestBudget(ERPNextTestSuite):
 	def test_duplicate_budget_validation(self):
 		make_budget(
 			budget_against="Cost Center",
-			distribute_equally=0,
+			distribute_equally=1,
 			budget_amount=15000,
 			do_not_save=False,
-			submit_budget=False,
+			submit_budget=True,
 		)
 
 		budget = frappe.new_doc("Budget")