fix: calculation of P/L in balance sheet

erpnext/accounts/report/balance_sheet/balance_sheet.py

@@ -124,11 +124,11 @@ def get_provisional_profit_loss(
 			key = period if consolidated else period.key
 			effective_liability = 0.0
 			if liability:
-				effective_liability += flt(liability[-2].get(key))
+				effective_liability += flt(liability[0].get(key))
 			if equity:
-				effective_liability += flt(equity[-2].get(key))
+				effective_liability += flt(equity[0].get(key))
 
-			provisional_profit_loss[key] = flt(asset[-2].get(key)) - effective_liability
+			provisional_profit_loss[key] = flt(asset[0].get(key)) - effective_liability
 			total_row[key] = effective_liability + provisional_profit_loss[key]
 
 			if provisional_profit_loss[key]:
@@ -193,11 +193,11 @@ def get_report_summary(
 	for period in period_list:
 		key = period if consolidated else period.key
 		if asset:
-			net_asset += asset[-2].get(key)
+			net_asset += asset[0].get(key)
 		if liability:
-			net_liability += liability[-2].get(key)
+			net_liability += liability[0].get(key)
 		if equity:
-			net_equity += equity[-2].get(key)
+			net_equity += equity[0].get(key)
 		if provisional_profit_loss:
 			net_provisional_profit_loss += provisional_profit_loss.get(key)