Sign of document

Hi, I have a problem with signing document with “memo” form. The root of problem seems to be “From” item.

Step to reproduce:

  1. Create the memo form

  2. Call the compute with form method or add the “From” item and set the isSign property of this item to “True”

  3. Save the document

  4. All the java API and the LotusScritp checks sign methods will give correct information. i.e. isSignred = true, getSigner=“CN=User/O=organization”, getVerifier = “o=organization”

  5. Domino will write “This document hase been altered since it was signed!” in the status bar. The signature icon would not active.

But if the “From” item isSign property set to “False” then the Domino will wrote: “Signed by user on 16.04.2009 12:00:00, according to /organization”

Is this something wrong in my scenario or this is Domino bug?