diff --git a/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py b/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py
index 05c1bc4886..ecbf78ce37 100644
--- a/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py
+++ b/erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py
@@ -190,8 +190,9 @@ class PaymentReconciliation(Document):
 				if flt(p.allocated_amount) > flt(p.amount):
 					frappe.throw(_("Row {0}: Allocated amount {1} must be less than or equals to JV amount {2}")
 						.format(p.idx, p.allocated_amount, p.amount))
-
-				if flt(p.allocated_amount) > unreconciled_invoices.get(p.invoice_type, {}).get(p.invoice_number):
+				
+				invoice_outstanding = unreconciled_invoices.get(p.invoice_type, {}).get(p.invoice_number)
+				if abs(flt(p.allocated_amount) - invoice_outstanding) > 0.009:
 					frappe.throw(_("Row {0}: Allocated amount {1} must be less than or equals to invoice outstanding amount {2}")
 						.format(p.idx, p.allocated_amount, unreconciled_invoices.get(p.invoice_type, {}).get(p.invoice_number)))
 
diff --git a/erpnext/stock/get_item_details.py b/erpnext/stock/get_item_details.py
index 82446ed420..faf3d98c0f 100644
--- a/erpnext/stock/get_item_details.py
+++ b/erpnext/stock/get_item_details.py
@@ -300,7 +300,7 @@ def get_serial_nos_by_fifo(args, item_doc):
 		order by timestamp(purchase_date, purchase_time) asc limit %(qty)s""", {
 			"item_code": args.item_code,
 			"warehouse": args.warehouse,
-			"qty": cint(args.qty)
+			"qty": abs(cint(args.qty))
 		}))
 
 def get_actual_batch_qty(batch_no,warehouse,item_code):