Project ID - Sequences Number

Hi All,

I have problem in Project ID sequences number:

Below is my sequences number set up:

and this is my project ID:

In my case there is no correlation or validation between my sequence number set up and my Project ID when I tick "Manual" numbering.

There although my first 4 digits should be "1000" when I fill with "10" system won't respond any warning/error message.

As well as the last digits which should be only 9 digits but it can be filled with 13 digits.

Is there anyone has explanation about this? Or can I make validation of Project ID number that should aligned with the number sequences?

Thanks,

M.H.