Srividhya
You must define both the PK and the PI on the 'Indexes' window for the table.
You can define the PK and uncheck the 'generate' check box (forward engineering won't create it). Then you can create the PI as another index and set it as 'primary' in the options tab. Additionaly, you can mark it 'phisical only'.
HTH.
Cheers.
Carlos.
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