refactor!: change "is_subcontracted" field type from "Select" to "Check"
diff --git a/erpnext/controllers/buying_controller.py b/erpnext/controllers/buying_controller.py
index 4789207..c0fd83e 100644
--- a/erpnext/controllers/buying_controller.py
+++ b/erpnext/controllers/buying_controller.py
@@ -167,7 +167,7 @@
 					_("Row #{0}: Accepted Warehouse and Supplier Warehouse cannot be same").format(item.idx)
 				)
 
-			if item.get("from_warehouse") and self.get("is_subcontracted") == "Yes":
+			if item.get("from_warehouse") and self.get("is_subcontracted"):
 				frappe.throw(
 					_(
 						"Row #{0}: Cannot select Supplier Warehouse while suppling raw materials to subcontractor"
@@ -342,7 +342,7 @@
 		if not self.is_subcontracted and self.sub_contracted_items:
 			frappe.throw(_("Please enter 'Is Subcontracted' as Yes or No"))
 
-		if self.is_subcontracted == "Yes":
+		if self.is_subcontracted:
 			if self.doctype in ["Purchase Receipt", "Purchase Invoice"] and not self.supplier_warehouse:
 				frappe.throw(_("Supplier Warehouse mandatory for sub-contracted {0}").format(self.doctype))
 
@@ -363,14 +363,14 @@
 					item.bom = None
 
 	def create_raw_materials_supplied(self, raw_material_table):
-		if self.is_subcontracted == "Yes":
+		if self.is_subcontracted:
 			self.set_materials_for_subcontracted_items(raw_material_table)
 
 		elif self.doctype in ["Purchase Receipt", "Purchase Invoice"]:
 			for item in self.get("items"):
 				item.rm_supp_cost = 0.0
 
-		if self.is_subcontracted == "No" and self.get("supplied_items"):
+		if not self.is_subcontracted and self.get("supplied_items"):
 			self.set("supplied_items", [])
 
 	@property
@@ -803,7 +803,7 @@
 		if self.doctype == "Material Request":
 			return
 
-		if hasattr(self, "is_subcontracted") and self.is_subcontracted == "Yes":
+		if hasattr(self, "is_subcontracted") and self.is_subcontracted:
 			validate_item_type(self, "is_sub_contracted_item", "subcontracted")
 		else:
 			validate_item_type(self, "is_purchase_item", "purchase")