Auto Number on a form

[CherylStraw]

I have created a form using two tables that are linked from our Oracle Database. There is a field on a table called CALLS that is the CALL ID, I would like this to be an autonumber field but this isn't an option in Oracle (or at least that's what I have been told). Is there some way to make this field automatically populate with a number? Please let me know if you need more details to answer my question correctly. I don't have much experience using Access and even less using Oracle so thanks for your patience!