deleting physical inventory ledger entries

I am attempting to delete a physical inventory ledger entry in NAV 2009.

An error comes up stating :

The Phys.Inventory Ledger Entry table does not have an active key that starts with the following field or fields: Item No, Variant Code, Posting Date.

Where can I find the table and how do I set an active key ?

thanks

table 281 “Phys. Inventory Ledger Entry” → design table ->View → Key and you can see list of keys

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And why you want to delete this?

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