Reverse Engineering : Nulls

[pellismgm]

I am trying to reverse engineer a Sybase database. It's rather large so I'm selecting three tables that I know are related.

When I attempt to reverse engineer, I get the following Sybase error message :

Attempt to insert NULL value into column 3 in work table (table id : -456758); column does not allow nulls. Update fails.

Then I get a dialog box : Unable to select foreign keys.

This happens for every table I selected, so the result is I get a diagram with unrelated tables - not very helpful !

Can anyone suggest what I must be doing wrong ? It's a production database , so (i hope) the database itself is okay....

 

[pellismgm]

Cancel this query - it transpires that I was running version ***6*** of Powerdesigner - version 10 does not exhibit the same problems....!