Does anyone know a way of making primary keys updatable in tabular forms

Is there a way i can make my primary key updatable in a tabular form.
I have two tables one called proposal details and one called student current details. Bascially you select one of your proposal details to become your current project this is done via the proposal id. The problem is that i cannot make this field editable in a tabular form. Does anyone know how i could make this primary key updatable?

Hi Dan,
One suggestion, perhaps, would be to base the tabular form on a View rather than directly off of the table. The view could include two instances of the proposal id field - the actual field and a second field called, say, PROPOSAL_ID_EDITABLE. You can then use an INSTEAD OF trigger on the view to update the actual table data with the value entered/selected in this second field.
The reason why Apex will stop you updating primary keys is that it needs to be able to use these to get back to the original record to apply any changes. If you use a view instead, ensure that the primary key fields are not editable but allow the user to change a dummy field instead, the pk fields are available for Apex to get back to the data but the trigger will change the value instead.
Regards
Andy

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