missing primary key in a table

Hi
I have just made a project, on apex. I have added a master page to show me the detail of required entities, but in the master page (I even have added the primary key along with all the other attributes), but I cannot find the primary key for it.  Then when I want to add any new raw to that table, it returns error because of leaving the attribute that is dedicated for the primary key empty.

Can anyone please find me a solution regarding building master pages issues in apex?

Please also find the pictures of the type of error I get in the link below

http://www.rostem.net/PID/index.html
swrdashAsked:
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ppinonCommented:
You probably have to generate a PK value using a trigger (+ eventually a sequence) since it cannot be null.

Check http://forums.oracle.com/forums/thread.jspa?threadID=691963 , the problem seems to be the same
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