Electronic Nota Fiscal for rural producers

For invoice processes for rural producers, the CPF Number is used, as they do not have a CNPJ number. As the CPF number has fewer characters than the CNPJ, it does not close with the total number of digits needed to close the Access Key of the Electronic Nota Fiscal, since the CPF number has 11 characters and CNPJ number has 13 characters.

Is there any SAP Note for this requirement? It was tried to search for SAP Note but it was not possible to find them.