Thank you both.It works

Thanx a lot!It works perfect

Found the answer (i think it's stupid that it works this way, but who am i....)I've used this script to generate my numberThat number will be saved with the PDF and doesn't change when i save, close and open the pdf againif (xfa.resolveNode("FieldName").rawValue != null){ } else { xfa.resolveNode("FieldName").rawValue = util.printd("ddmmyyyyHHMMss", new Date()); }Now comes the fun partI've created a script object with the script above and put a script reference at: myField -> Form:readyNow when ...

It's for a declaration form, the user must download this from a server.The number must be generated when the user opens the form the first time.When the user saves the document, that number must also be saved, so the same number will show up when the user opens that form again.It's not permitted to change that number (not even on reset)I hope you understand my poor English

That's the problemI need to enable the Reader RightsSo i have to reset that field one timeAny suggestions?