SQL Developer

Hi,
Problem:
When trying to add a Foreign Key via Edit Table | Foreign Key tab an error is thrown

Error:
"ORA-00942: table or view does not exit", Vendor code 942

SQL Developer Generated DDL:
ALTER TABLE "CNArticlesCODES"
DROP CONSTRAINT "CNArticlesCODES_FK1"
;

ALTER TABLE "CNArticlesCODES"
ADD CONSTRAINT "CNArticlesCODES_FK1" FOREIGN KEY
(
"ID"
) REFERENCES CNArticlesDATA
(
"ID"
) ENABLE
;

My work around:
table name next to REFERENCES command in double quotes

ALTER TABLE "CNArticlesCODES"
ADD CONSTRAINT "CNArticlesCODES_FK1" FOREIGN KEY
(
"UID"
) REFERENCES "CNArticlesCODES"
(
"UID"
) ENABLE
;

SQL Developer 1.0.0.15.57 on Windows XP SP2

Oracle Database 10g Enterprise Edition Release 10.2.0.10 (Eval Lic) on Windows 2003 Web Edition 32 bit

The 2 tables in this example where generated by MS DTS tool while importing data. This issue is not present when performing the above action on 2 tables generated using SQL Developer.

I'm no database expert and new to Oracle (R&D stage of SQL Server to Oracle migration). So can some body tell me/point me at docs that explains what's going on here with the table names.

Thanks