ORA-02270 - Can't find fault - sql

Question

Having trouble with a ORA-02270 error. After going through the primary keys and foreign keys over and over, I can't find what the problem is.
CREATE TABLE CUSTACC(
REFNO CHAR(4),
ACCNO NUMBER(7),
CONSTRAINT CUSTACC_PK PRIMARY KEY (REFNO, ACCNO));
CREATE TABLE CUST(
CUSTNO CHAR(4),
NAME VARCHAR2(30),
ADDRESS VARCHAR2(50),
AREA VARCHAR2(10),
CONSTRAINT CUSTNO_PK PRIMARY KEY(CUSTNO),
CONSTRAINT CUSTNO_FK FOREIGN KEY (CUSTNO)
REFERENCES CUSTACC(REFNO));
CREATE TABLE ACC(
ACCNO NUMBER(7),
BALANCE NUMBER(8,2),
BRANCH VARCHAR2(10),
OPENED DATE,
BONUS NUMBER(8,2),
CONSTRAINT ACCNO_PK PRIMARY KEY (ACCNO),
CONSTRAINT ACCNO_FK FOREIGN KEY (ACCNO)
REFERENCES CUSTACC(ACCNO));
I must be blind but I've checked everything people have suggested before.

Answer 1

The primary key on CUSTACC consists of two columns: REFNO and ACCNO.
The foreign key reference should include both of them. So, your tables need both columns.
I suspect, in fact, that you want the foreign key reference in the first table, something like this:
CREATE TABLE CUST (
CUSTNO CHAR(4),
NAME VARCHAR2(30),
ADDRESS VARCHAR2(50),
AREA VARCHAR2(10),
CONSTRAINT CUSTNO_PK PRIMARY KEY(CUSTNO)
);
CREATE TABLE ACC (
ACCNO NUMBER(7),
BALANCE NUMBER(8,2),
BRANCH VARCHAR2(10),
OPENED DATE,
BONUS NUMBER(8,2),
CONSTRAINT ACCNO_PK PRIMARY KEY (ACCNO)
);
CREATE TABLE CUSTACC (
REFNO CHAR(4),
ACCNO NUMBER(7),
CONSTRAINT CUSTACC_PK PRIMARY KEY (REFNO, ACCNO),
CONSTRAINT CUSTNO_FK FOREIGN KEY (REFNO)
REFERENCES CUST(CUSTNO),
CONSTRAINT ACCNO_FK FOREIGN KEY (ACCNO)
REFERENCES ACC(ACCNO)
);
Here is a SQL Fiddle.