fix: valuation rate in report Item Prices (#38161)

Co-authored-by: PatrickDenis-stack <77415730+PatrickDenis-stack@users.noreply.github.com>
diff --git a/erpnext/stock/report/item_prices/item_prices.py b/erpnext/stock/report/item_prices/item_prices.py
index ab47b4a..a53a9f2 100644
--- a/erpnext/stock/report/item_prices/item_prices.py
+++ b/erpnext/stock/report/item_prices/item_prices.py
@@ -202,7 +202,7 @@
 	bin_data = (
 		frappe.qb.from_(bin)
 		.select(
-			bin.item_code, Sum(bin.actual_qty * bin.valuation_rate) / Sum(bin.actual_qty).as_("val_rate")
+			bin.item_code, (Sum(bin.actual_qty * bin.valuation_rate) / Sum(bin.actual_qty)).as_("val_rate")
 		)
 		.where(bin.actual_qty > 0)
 		.groupby(bin.item_code)