fix(patch): patch duplicate bins

erpnext/patches.txt

@@ -1,5 +1,6 @@
 [pre_model_sync]
 erpnext.patches.v12_0.update_is_cancelled_field
+erpnext.patches.v13_0.add_bin_unique_constraint
 erpnext.patches.v11_0.rename_production_order_to_work_order
 erpnext.patches.v11_0.refactor_naming_series
 erpnext.patches.v11_0.refactor_autoname_naming

erpnext/patches/v13_0/add_bin_unique_constraint.py

@@ -0,0 +1,45 @@
+import frappe
+
+from erpnext.stock.stock_balance import (
+	get_balance_qty_from_sle,
+	get_indented_qty,
+	get_ordered_qty,
+	get_planned_qty,
+	get_reserved_qty,
+	update_bin_qty,
+)
+
+
+def execute():
+
+	duplicate_rows = frappe.db.sql("""
+		SELECT
+		item_code, warehouse
+		FROM
+			tabBin
+		GROUP BY
+			item_code, warehouse
+		HAVING
+			COUNT(*) > 1
+	""", as_dict=1)
+
+	for row in duplicate_rows:
+		bins = frappe.get_list("Bin",
+							   filters={"item_code": row.item_code,
+										"warehouse": row.warehouse},
+							   fields=["name"],
+							   order_by="creation",
+							   )
+
+		for x in range(len(bins) - 1):
+			frappe.delete_doc("Bin", bins[x].name)
+
+		qty_dict = {
+			"reserved_qty": get_reserved_qty(row.item_code, row.warehouse),
+			"indented_qty": get_indented_qty(row.item_code, row.warehouse),
+			"ordered_qty": get_ordered_qty(row.item_code, row.warehouse),
+			"planned_qty": get_planned_qty(row.item_code, row.warehouse),
+			"actual_qty": get_balance_qty_from_sle(row.item_code, row.warehouse)
+		}
+
+		update_bin_qty(row.item_code, row.warehouse, qty_dict)