In Customer service , if the state is cancelled , make everything readonly by client script.

[Tanushree Maiti]

Hi @prastuti 

Best practice is to use UI policy over Client Script to make fields Visible/mandatory/ReadOnly.

By the way , what issue - you are facing. Give a screen shot.

[Sneha KH]

Hello @prastuti,
Go to System UI--> UI Policies. Fill the case table and in when to apply tab add condition as state is cancelled and save the record. In UI Policy Action related list give field name and check read only field.
UI Policy is best than Client Script to add and to avoid unnecessary script. Best practice is UI Policy.

[Ankur Bawiskar]

@prastuti 

why client script? I won't recommend client script. Use ACL

You should achieve this using Table.None WRITE ACL so that it's blocked from Form and List

Check OOTB ACL on Case table and modify accordingly

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[Ankur Bawiskar]

@prastuti 

Hope you are doing good.

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