fix shift sale balance

app/models/sale_payment.rb

@@ -81,7 +81,7 @@ class SalePayment < ApplicationRecord
       amount_due = invoice.sale_payments
       .map(&:payment_amount).reduce(invoice.grand_total, :-)
     end
-
+    
     if amount_due > 0
       payment_status = false
       membership_data = nil
@@ -374,7 +374,7 @@ class SalePayment < ApplicationRecord
 
   private
   def cash_payment(payment_for=false)
-    
+
     sale_payments_data = SalePayment.find_by_sale_id(self.sale_id)
     payment_status = false
 
@@ -391,7 +391,7 @@ class SalePayment < ApplicationRecord
     payment_status = self.save!
     if !payment_for
       sale_update_payment_status(self.received_amount)
-    else 
+    else
       update_shift_for_credit_payment()
     end
 
@@ -636,6 +636,9 @@ class SalePayment < ApplicationRecord
 
   def sale_update_payment_status(paid_amount, check_foc = false)
     #update amount_outstanding
+    if ['completed'].include? sale.sale_status
+      return
+    end
     sale = self.sale
     sale_payments = sale.sale_payments.reload