For each incoming boleto, the carteira number must be entered together with the bank duplicata number in the Duplicata number field of the open item:

Carteira nr/Bank duplicata nr: XXX/YY...Y-Z

XXX: Carteira number (e.g. 110 for Itaú)

YY...Y: Bank duplicata number (e.g. 8 digits for Itaú)

Z: Control digit for bank duplicata number