Hi umesh,

Generally speaking, you shouldn't need to lock the fields - you just need to use the right field for the job. For example, if you use the CREATEDATE field, the only time it will update is if you re-save the document using Save As. Similarly, the PRINTDATE field updates every time the document is printed and the SAVEDATE field updates every time the document is saved. The only field that updates every time the document is opened is the plain DATE field.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]