Problem with the relationship in the Motherboard (Inheritance) in PostgreSql

I have the Mother Table Payment:

CREATE TABLE pagamento
(
  pagcod serial not null,      
  CONSTRAINT pk_pag PRIMARY KEY (pagcod)
)

And the two daughters tables Money and Credit Card:

CREATE TABLE dinheiro
(
  desconto numeric(10,2) DEFAULT 0.00,
  juros numeric(10,2) DEFAULT 0.00
)inherits(pagamento); 

CREATE TABLE cartao_credito
(
  num_cartao integer NOT NULL,
  datavalidade date NOT NULL,
  senha character varying(256) NOT NULL,
  agencia integer NOT NULL,
  titular character varying(200) NOT NULL
)inherits(pagamento);

When I am going to give the INSERT in the MONEY table for example the PAGCOD attribute of the PAYMENT mother table comes automatically:

INSERT INTO dinheiro(pagcod, desconto, juros)VALUES (4, 100.00, 12.5);

Giving a SELECT * FROM DINNER The PK normally appears:

JustlikegivingaSELECT*FROMPAYMENTthePKalsoappearsnormally:

PROBLEM:WhenItrytoreferencethispaymentpkintheORDERtable:

CREATETABLEpedido(pedcodserialnotnull,peddatadateNOTNULL,ped_num_notafiscalintegerNOTNULL,pedstatusvarchar(20)NOTNULLDEFAULT'ABERTO',ped_funcinariointegerNOTNULL,ped_clieteintegerNOTNULL,ped_pagamentointeger,CONSTRAINTpk_pedidoPRIMARYKEY(pedcod),CONSTRAINTfk_clienteFOREIGNKEY(ped_cliete)REFERENCEScliente(clicod),CONSTRAINTfk_funcionarioFOREIGNKEY(ped_funcinario)REFERENCESfuncionario(funcod),CONSTRAINTfk_pagamentoFOREIGNKEY(ped_pagamento)REFERENCESpagamento(pagcod));

Thefollowingerrorappears:

Could someone give me a light on how to solve this problem? The PK appears in the PAY table, but when I try to reference it in the REQUEST table give this error. The ORDER INSERT syntax:

INSERT INTO public.pedido(pedcod, peddata, ped_num_notafiscal, pedstatus, ped_funcinario, ped_cliete, ped_pagamento)
    VALUES (7, '02-11-2017', 2323, 1, 1, 1, 4);