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Duplicata Number 
A number that uniquely identifies a single duplicata. The system refers to two types of duplicata number:
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1. Company duplicata number (seu número)
The payment program generates this number; it is composed of the nota fiscal number and the line item number.

Nota fiscal number: 123456
Line item number: 001
Duplicata number: 123456001
2. Bank duplicata number (nosso número)
The bank generates this number, and includes it in the return file it sends to confirm receipt of the original file (see Communication with Bank).
