What do you mean with " update Deliveries document already created" ?
Can you explain use case step by step ?

Please also join content of log file showing complete error loggued.

I mean, I open DELIVERYS view, create new DELIVERYS, save it. Then open it, and try to save (even without modifications).

What is probably important, problem startes to appear after modification of look of this form I define in customization.

It means, we have:

Try and rename field "index".
It is possible that this is a reserved SQL key word.
If this is confirmed, we'll add control about this on the plugin.

Thanks, I removed field "index" and declare new one as "versionindex" and all is fine (rename is not possible in customization view).

Personally I think it is not good to create directly user named fields in DB... a little bit risky without any prefixes/sufixes.

Anyway, thanks for help.