feat: added negative inventory validation and restrict to make backdated entry for serial nos
diff --git a/erpnext/stock/deprecated_serial_batch.py b/erpnext/stock/deprecated_serial_batch.py
index 33b8955..f2d266a 100644
--- a/erpnext/stock/deprecated_serial_batch.py
+++ b/erpnext/stock/deprecated_serial_batch.py
@@ -69,7 +69,8 @@
 	def calculate_avg_rate_from_deprecarated_ledgers(self):
 		ledgers = self.get_sle_for_batches()
 		for ledger in ledgers:
-			self.batch_avg_rate[ledger.batch_no] += flt(ledger.incoming_rate) / flt(ledger.qty)
+			self.batch_avg_rate[ledger.batch_no] += flt(ledger.batch_value) / flt(ledger.batch_qty)
+			self.available_qty[ledger.batch_no] += flt(ledger.batch_qty)
 
 	def get_sle_for_batches(self):
 		batch_nos = list(self.batch_nos.keys())