diff --git a/app/models/p_customer.rb b/app/models/p_customer.rb
index 030d011..5f8b579 100644
--- a/app/models/p_customer.rb
+++ b/app/models/p_customer.rb
@@ -188,7 +188,7 @@ class PCustomer < ActiveRecord::Base
       
     end
       
-      
+    self.update_caches
   end
   
   
diff --git a/app/models/p_payment_document.rb b/app/models/p_payment_document.rb
index addb3a0..411ca2e 100644
--- a/app/models/p_payment_document.rb
+++ b/app/models/p_payment_document.rb
@@ -35,7 +35,7 @@ class PPaymentDocument < ActiveRecord::Base
       
       if sum.round(2) > self.p_document.totals[:total_ttc].to_f.round(2)
       
-        errors.add(:amount, "Ne doit pas dépasser le montant de la somme restant dues (#{self.p_document.totals[:total_ttc].to_f - siblings_payments_total})") 
+        errors.add(:amount, "Ne doit pas dépasser le montant de la somme restant dues (#{(self.p_document.totals[:total_ttc].to_f.round(2) - siblings_payments_total.to_f.round(2)).round(2)})") 
       end