Suggested by Elisabete de Souza Padula – New
When generating a service invoice, the NAT_BC_CRED field is fixed at "03".
According to the practical guide, you must follow table 4.3.7 of the SPED Contributions manual.
07 NAT_BC_CRED Código da base de cálculo do crédito, conforme a Tabela indicada no item 4.3.7, caso seja informado
http://sped.rfb.gov.br/estatico/AD/06A0F5C4E4CC8CA16035EB891A3AE31EA79708/Guia_Pratico_EFD_Contribuicoes_Versao_1_35%20-%2018_06_2021.pdf