fix: skip last purchase rate for free item (backport #47693) (#47695)

fix: skip last purchase rate for free item (#47693)

(cherry picked from commit c3b17024bd)

Co-authored-by: rohitwaghchaure <rohitw1991@gmail.com>

erpnext/buying/utils.py

@@ -20,6 +20,9 @@ def update_last_purchase_rate(doc, is_submit) -> None:
 	this_purchase_date = getdate(doc.get("posting_date") or doc.get("transaction_date"))
 
 	for d in doc.get("items"):
+		if d.get("is_free_item"):
+			continue
+
 		# get last purchase details
 		last_purchase_details = get_last_purchase_details(d.item_code, doc.name)