How to make Incident number readonly?

[Eugene3]

No one should be able to change incident number

[Pranav Bhagat]

You can use dictionary overrides to make it read-only.

Regards

Pranav   

[Willem]

If you want to do it anyway. Please do not set it on the dictionary, but use dictionary override:

Then:

Then:

[Mark Roethof]

Hi Eugene,

Agree with the comment Willem made about the ACL with write access for admin users. Please mark that answer as correct.

I also saw some replies about changing the TASK dictionary entry. You could do that also, though be aware: then YOU own this dictionary record. So might it be changed by ServiceNow in any future patch/upgrade, a skipped update or you miss out on that update.

What for sure not to do:
Making the number field read only through client side scripting. That's really a horrible solution.

If my answer helped you in any way, please then mark it as helpful.

Kind regards,
Mark
2020 ServiceNow Community MVP
2020 ServiceNow Developer MVP

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[AbhishekGardade]

I agree what Mark said, If you are modifying any out of the box configuration, it will be skipped from future upgrades.

Thank you ,

Abhishek