Can't add new detail record in Master Detail form

Hi ,
I've created a simple database application from scratch by initially selecting a Master Detail page. This generated a report page (for the parent ) and a form page (for the child ). On using the form to add a new child record the following error was generated:
Error in mru internal routine: ORA-20001: Error in MRU: row= 1, ORA-01400: cannot insert NULL into ("STUDENT1"."DELEGATE"."DELEGATE_ID"), insert into "STUDENT1"."DELEGATE" ( "DELEGATE_ID", "CLIENT_ID", "SURNAME", "INITIALS", "SEX", "SPECIAL_NEEDS") values ( :b1, :b2, :b3, :b4, :b5, :b6)
Error Unable to process update.
The 'child' field listed in the error message is automatically hidden on the form and I had presumed that on generating this form using the wizard that I would have had an opportunity to link the delegate_id field to a trigger or a sequence as seems to happen when creating a database application scratch using other page types. I'm new to Apex so I'd be grateful if anyone could let me know as to why this default behaviour occurs,
regards,
Kevin.

I tried it for Apex 4.0.2 (my version) and 4.1 (on apex.oracle.com) and I am asked for master and detail PK generation in both versions.
What are your steps exactly in the wizard? Like this?
Create page -> Form -> Master Detail Form
Now you see a whole list of sub steps including "Primary Key Source".
Oh I see "Create Application wizard." in your post. Start with an empty application (blank page) and use the Create Page wizard instead. Maybe that's the difference.
Edited by: InoL on Nov 18, 2011 9:27 AM

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