Problem with view based on Object Table

Question

When I try to create the Invoice view below SQL*Plus returns:
"ORA-00904: invalid column name"
My view appears to be correct. I doubt 'Expires' is a reserved word since if I NULL it out then the next column('Issued') causes the same error.
Any suggestions?
Here's my layout of types and tables:
CREATE OR REPLACE TYPE Address_objtyp AS OBJECT (
Street1 VarChar2(200),
Street2 VarChar2(200),
City VarChar2(200),
State Char(2),
Zip VarChar2(20)
CREATE OR REPLACE TYPE CreditCard_objtyp AS OBJECT (
NameOnCard VarChar2(100),
Address_obj Address_objtyp,
CardType VarChar2(50),
CardNum Number,
Issued DATE,
Expires DATE
CREATE OR REPLACE TYPE Invoice_objtyp AS OBJECT (
IDNum Number(5),
InvDate DATE,
InvType VarChar2(20),
Fee Number(10,2),
PaidDate DATE,
AmtPaid Number(10,2),
PayMethod VarChar2(50),
CheckNum Number(10),
CreditCard_obj CreditCard_objtyp
CREATE TABLE Invoice_objtab OF Invoice_objtyp (
PRIMARY KEY (IDNum))
OBJECT ID PRIMARY KEY;
CREATE OR REPLACE VIEW Invoice_view OF Invoice_objtyp WITH OBJECT IDENTIFIER DEFAULT
AS SELECT i.InvDate, i.InvType, i.Fee, i.PaidDate, i.AmtPaid, i.PayMethod, i.CheckNum,
CreditCard_objtyp(i.NameOnCard, Address_objtyp(i.Street1, i.Street2, i.City, i.State, i.Zip), i.CardType, i.CardNum, i.Issued, i.Expires)
FROM Invoice_objtab i;

Answer 1

Missing the IDNum. Create view statement should read:
CREATE OR REPLACE VIEW Invoice_view OF Invoice_objtyp WITH OBJECT IDENTIFIER DEFAULT
AS SELECT i.IDNum, i.InvDate, i.InvType, i.Fee, i.PaidDate,
i.AmtPaid, i.PayMethod, i.CheckNum,
CreditCard_objtyp(i.NameOnCard,
Address_objtyp(i.Street1, i.Street2, i.City, i.State, i.Zip),
i.CardType, i.CardNum, i.Issued, i.Expires)
FROM Invoice_objtab i;
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