fix: miscellaneous fixes (#18615)

erpnext/stock/doctype/item/item.json

@@ -468,7 +468,6 @@
    },
    {
     "default": "0",
-    "depends_on": "has_batch_no",
     "fieldname": "retain_sample",
     "fieldtype": "Check",
     "label": "Retain Sample"

erpnext/stock/doctype/purchase_receipt/purchase_receipt.js

@@ -190,7 +190,7 @@ erpnext.stock.PurchaseReceiptController = erpnext.buying.BuyingController.extend
 					frappe.set_route("Form", doc.doctype, doc.name);
 				}
 				else {
-					frappe.msgprint(__("Retention Stock Entry already created or Sample Quantity not provided"));
+					frappe.msgprint(__("Purchase Receipt doesn't have any Item for which Retain Sample is enabled."));
 				}
 			}
 		});