"The out-of-line foreign keys documentation at Oracle® Database SQL Reference
10g Release 2 (10.2)
Part Number B14200-02
(no page number, but is headed 'constraint')
There is no comma specified as being allowed so that more than one column can be listed at a time in the diagram:
Description of references_clause.gif follows
Description of the illustration references_clause.gif
but it seems to work. Indeed it says in the worded part:
"The corresponding column or columns of the foreign key and the referenced key must match in order and datatype." Note the reference to "columns".
Then, when I asked the customer where did he see that, he updated as below:
" Hi, Unfortunatley I didn't save a copy of the message I sent, so I'm not sure what else to add.
I found my way to http://www.oracle.com/technetwork/indexes/documentation/index.html