Dynamic stamp with acro dialog

Hi All,

I have created a stamp acrobat custom dialog containing a few fields. All works fine when I use the stamp first time but as I choose it again and put on document dialog does not appear for input.

I have many old stamps created in past. Those all also having same issue is there any issue with the code or problem with Acrobat DC. I remember all was fine with acrobat 11.

Please help.  Stamp triggering code is below.

if (event.source && event.source.forReal && event.source.stampName == "#vw3mBZoIDLu-YhiEXZcuvA") {

    if ("ok" == oDlg1.DoDialog()) {

  var   cMsg = oDlg1.sACC_No ;

        event.value = cMsg  ;

event.source.source.info.DocumentState = cMsg;

    }

}