ORA-01400 when trying to insert into schema.table.ID

Question

I have a table that stores rejected contract proposals.

CREATE TABLE "STATUS_CONTRATO" (
  "STC_ID" NUMBER NOT NULL,
  "CTB_CONTRATO" NUMBER NOT NULL,
  "STC_DATA" DATE NOT NULL,
  "STC_OBSERVACAO" VARCHAR2(200) NOT NULL,
  CONSTRAINT "STATUS_CONTRATO_PK" 
    PRIMARY KEY ( "STC_ID") 
    ENABLE 
    VALIDATE,
  CONSTRAINT "FK_CONTRATO" 
    FOREIGN KEY ( "CTB_CONTRATO")
       REFERENCES "CONTRATO" ( CTB_CONTRATO) 
       ON DELETE SET NULL 
    ENABLE 
    VALIDATE)
;

(Script generated by Visual Studio 2010)

This table has a simple Trigger, where the value of STC_ID is set:

TRIGGER "STATUS_CONTRATO_TRIGGER1"
  BEFORE
  INSERT
  ON "STATUS_CONTRATO"
  FOR EACH ROW

when (new.STC_ID = 0)
DECLARE
BEGIN 
  SELECT SEQ_STATUS_ID.NEXTVAL INTO :NEW.STC_ID FROM DUAL;
END;

SEQ_STATUS_ID is a simple sequence.

Here's my problem:

I can successfuly execute this insert in the VS2010 query window:

insert into myschema.STATUS_CONTRATO s(
  s.STC_ID, s.CTB_CONTRATO, s.STC_DATA, s.STC_OBSERVACAO
)values(
  0, 10, SYSDATE, 'Inserting by hand works'
);

But, when I try to insert using EF, I'm getting this exception:

System.Data.UpdateException: An error occurred while updating the entries. 
See the inner exception for details. ---> Oracle.DataAccess.Client.OracleException: 
ORA-01400: cannot insert NULL into ("MYSCHEMA"."STATUS_CONTRATO"."STC_ID")
ORA-06512: at line 4

I'm using this code to insert

STATUS_CONTRATO statusContrato = new STATUS_CONTRATO() {
    STC_ID = 0,
    CTB_CONTRATO = codContrato,
    STC_DATA = DateTime.Today,
    STC_OBSERVACAO = observacao
};
ent.STATUS_CONTRATO.AddObject(statusContrato);
ent.SaveChanges();

I'm using VS2010, Oracle 11g (CentOS Server), ODP.NET client 11.2.0.3.0 Production, .NET Framework 4.0, EF 4.

Answer 1

Check this: http://www.oracle.com/technetwork/issue-archive/2011/11-sep/o51odt-453447.html

Particularly, section "Triggers and Sequences"

From the Tools menu, select Run SQL Plus Script. Browse to the location where you extracted the code and scripts, select the triggers.sql script, select the HR connection from the list, and click Run. The INSERTEMPLOYEES trigger created by the script generates a new sequence for EMPLOYEE_ID whenever NULL is passed in for that value........