fix: list index out of range (#37880)

* fix: list index out of range

* fix: changes in error message

* fix: change error message and date comparision

* fix: change a return a value when disposal date is equal to available for use date

* fix: changes to fix linter test failing

erpnext/assets/doctype/asset/depreciation.py

@@ -740,6 +740,15 @@ def get_disposal_account_and_cost_center(company):
 def get_value_after_depreciation_on_disposal_date(asset, disposal_date, finance_book=None):
 	asset_doc = frappe.get_doc("Asset", asset)
 
+	if asset_doc.available_for_use_date > getdate(disposal_date):
+		frappe.throw(
+			"Disposal date {0} cannot be before available for use date {1} of the asset.".format(
+				disposal_date, asset_doc.available_for_use_date
+			)
+		)
+	elif asset_doc.available_for_use_date == getdate(disposal_date):
+		return flt(asset_doc.gross_purchase_amount - asset_doc.opening_accumulated_depreciation)
+
 	if asset_doc.calculate_depreciation:
 		asset_doc.prepare_depreciation_data(getdate(disposal_date))