Reconciliation between Accounts payables and Trail Balance Payable account

In AX 2009 after printing GL>>reports>>reconcilation > vendors it dose not show any diffrence with zero grand total ,but when comapring between Accounts payables vendors balances  and Trail Balance Payable account I can see diffrence ,

My qestion is how i can identify if this issue is bug by the system or its not ,and how I can spot these diffrences and Fix ?

I'm using AX 2009 RU6.