Hi all, 

Im in a trouble while connecting Salesforce to SAP(external system).

I got the wsdl and made the Apex Class.
I have generated the Self Signed Certificate, i put the certificate in Identity Provider.
I Downloaded the certificate and send the certificate as "pem" file to others persons, that said they have installed this "pem" file in the endpoint server.

But I got this error "Line: 84, Column: 1
System.CalloutException: IO Exception: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"
when i try to execute the request to webService.

This is my apex Class:

//Generated by wsdl2apex

public class filtrarProdutoIntegracao {
    public class Result_element {
        public String matnr;
        public String netpr;
        public String netwr;
        public String mwsbp;
        public String aufsg;
        private String[] matnr_type_info = new String[]{'matnr','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] netpr_type_info = new String[]{'netpr','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] netwr_type_info = new String[]{'netwr','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] mwsbp_type_info = new String[]{'mwsbp','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] aufsg_type_info = new String[]{'aufsg','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] apex_schema_type_info = new String[]{'http://******.com.br/SALESFORCE/ConsultaPrecoMaterial','false','false'};
        private String[] field_order_type_info = new String[]{'matnr','netpr','netwr','mwsbp','aufsg'};
    }
    public class DT_ConsPrecoMaterial_OB {
        public String vtweg;
        public String werks;
        public String kunnag;
        public String[] matnr;
        public String mgame;
        public String vkpne;
        public String skfbp;
        private String[] vtweg_type_info = new String[]{'vtweg','http://*****..com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] werks_type_info = new String[]{'werks','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] kunnag_type_info = new String[]{'kunnag','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] matnr_type_info = new String[]{'matnr','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','-1','false'};
        private String[] mgame_type_info = new String[]{'mgame','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] vkpne_type_info = new String[]{'vkpne','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] skfbp_type_info = new String[]{'skfbp','http://******.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'1','1','false'};
        private String[] apex_schema_type_info = new String[]{'http://******.com.br/SALESFORCE/ConsultaPrecoMaterial','false','false'};
        private String[] field_order_type_info = new String[]{'vtweg','werks','kunnag','matnr','mgame','vkpne','skfbp'};
    }
    public class DT_ConsPrecoMaterial_IB {
        public filtrarProdutoIntegracao.Result_element[] Result;
        private String[] Result_type_info = new String[]{'Result','http://*****.com.br/SALESFORCE/ConsultaPrecoMaterial',null,'0','-1','false'};
        private String[] apex_schema_type_info = new String[]{'http://*****.com.br/SALESFORCE/ConsultaPrecoMaterial','false','false'};
        private String[] field_order_type_info = new String[]{'Result'};
    }
    public class HTTPS_Port {
        public String endpoint_x = 'https://*******.com.br:44300/XISOAPAdapter/MessageServlet?senderParty=SALESFORCE&senderService=SALESFORCE&receiverParty=SALESFORCE&receiverService=SALESFORCE&interface=SI_ConsPrecoMaterial_OB&interfaceNamespace=http://*****.com.br/SALESFORCE/ConsultaPrecoMaterial';
        public Map<String,String> inputHttpHeaders_x = new Map<String,String>();   
        public Map<String,String> outputHttpHeaders_x;
        public String clientCertName_x = 'SelfSignedCert_300522';
       // public String clientCert_x;
        //public String clientCertPasswd_x;
        public Integer timeout_x;
        private String[] ns_map_type_info = new String[]{'http://*****/SALESFORCE/ConsultaPrecoMaterial', 'filtrarProdutoIntegracao'};
        public filtrarProdutoIntegracao.Result_element[] SI_ConsPrecoMaterial_OB(String vtweg,String werks,String kunnag,List<String> matnr,String mgame,String vkpne,String skfbp) {
            filtrarProdutoIntegracao.DT_ConsPrecoMaterial_OB request_x = new filtrarProdutoIntegracao.DT_ConsPrecoMaterial_OB();
            request_x.vtweg = vtweg;
            request_x.werks = werks;
            request_x.kunnag = kunnag;
            request_x.matnr = matnr;
            request_x.mgame = mgame;
            request_x.vkpne = vkpne;
            
            request_x.skfbp = skfbp;
            filtrarProdutoIntegracao.DT_ConsPrecoMaterial_IB response_x;
            Map<String, filtrarProdutoIntegracao.DT_ConsPrecoMaterial_IB> response_map_x = new Map<String, filtrarProdutoIntegracao.DT_ConsPrecoMaterial_IB>();
            response_map_x.put('response_x', response_x);
            //inputHttpHeaders_x.put('Authorization','Basic SU5URUdfU0Y=:MW50M2dyQDIwMjI=');
            WebServiceCallout.invoke(
              this,
              request_x,
              response_map_x,
              new String[]{endpoint_x,
              'http://sap.com/xi/WebService/soap1.1',
              'http://*****.com.br/SALESFORCE/ConsultaPrecoMaterial',
              'MT_ConsPrecoMaterial_OB',
              'http://*****.com.br/SALESFORCE/ConsultaPrecoMaterial',
              'MT_ConsPrecoMaterial_IB',
              'filtrarProdutoIntegracao.DT_ConsPrecoMaterial_IB'}
            );
            response_x = response_map_x.get('response_x');
            return response_x.Result;
        }
    }
}


I'm stuck somedays in this problems, im glad if someone help me! =)