Can't update a record, then my syntax is redundant

= a!forEach(
  pv!documentos,
  'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta'(
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{9edd3c74-2a43-4d35-a34a-f15156e24008}nome': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{9edd3c74-2a43-4d35-a34a-f15156e24008}nome'],
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{c5c850df-96fc-4f05-acac-ce2ec64be9fe}descricao': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{c5c850df-96fc-4f05-acac-ce2ec64be9fe}descricao'],
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{a0bd41fc-ae6a-4d8d-a639-811ceb6223dc}uri_bucket': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{a0bd41fc-ae6a-4d8d-a639-811ceb6223dc}uri_bucket'],
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{d47966a5-2a85-4921-9950-56bda2595d30}criadoPor': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{d47966a5-2a85-4921-9950-56bda2595d30}criadoPor'],
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{d73e4b62-7b68-429a-b48a-2e861a9a79a5}dataCriacao': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{d73e4b62-7b68-429a-b48a-2e861a9a79a5}dataCriacao'],
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{061962e7-7b4c-40ac-a241-8859811ac37c}modificadoPor': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{061962e7-7b4c-40ac-a241-8859811ac37c}modificadoPor'],
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{6403b911-5ec8-4442-8ee1-6989437932e3}dataAlteracao': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{6403b911-5ec8-4442-8ee1-6989437932e3}dataAlteracao'],
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.relationships.{b1179d0c-8b69-4c12-8191-feecf9a5edfe}criadoPorUser': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.relationships.{b1179d0c-8b69-4c12-8191-feecf9a5edfe}criadoPorUser'],
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.relationships.{565d913a-c85d-4b61-88b0-889e404348d6}modificadoPorUser': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.relationships.{565d913a-c85d-4b61-88b0-889e404348d6}modificadoPorUser'],
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.fields.{389973d7-a3f2-4ce3-aafb-9c2021e72ce9}propostaId': pv!idProposta,
    'recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.relationships.{7e39ce72-e568-45ea-b1da-d6b570e1aec9}gcTipoDocumento.fields.{9bc7b5d8-be3a-474a-8b87-40e8118629e7}id': fv!item['recordType!{1f7c4a8e-ee45-44c7-8872-dc5542133555}GC Documento Proposta.relationships.{7e39ce72-e568-45ea-b1da-d6b570e1aec9}gcTipoDocumento.fields.{9bc7b5d8-be3a-474a-8b87-40e8118629e7}id']
  )
)

a!update is not working properly for me, I am recieving this:

The input "Records" cannot insert or update a record which is referring to different referenced records via propostaId at the same time. To create a reference to a related record, include either a relationship reference or the required common field value for "propostaId". Location of conflicting changes: GC Proposta[1].documentoProposta[1]