Offset voucher Axxxxx in account xxxx has not been approved.

Hi everyone,

     This is all about the process FROM 'Drawing the BOE' TO 'remittance'. By keep this simple
1) we set up 'summary account' and 'settle account' in the posting profile for BOE (used when draw BOE)
    and RCBOE(used when BOE is remitted).
2) Also, we create the BOE: method of payment, identified the posting payment account as a bank account
3) Then, after we create sales transaction and payment through
     AR>Journal> Bill Of Exchange >draw BOE journal >Identify the Customer account
     and use function settlement. On BOE tab, we select bank account
     and select BOE method of payment on the overview tab, then post the transaction.
4) Next, we try to remit BOE through AR> journal> Bill of exchange> Remittance journal>function settlement
    and after posting, there is a warning message
    "Offset voucher ARBD00001 in account 1101 has not been approved."

Who know what is the caused of this error?