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The first and simple way of doing it, and portable across Jira versions, is by using the lfDisable routine from the Live Fields feature of our Power Scripts™ for Jira app.

Option 1

1. Create a SIL file called "Main Script" with the following code:
   
   

   Code Block
   title MainScript.sil
   lfDisable("customfield_xxxxx");

   where customfield_xxxxx is the the ID of your database child custom field. You can see the custom field ID as a parameter in the URL when editing its configuration. 
   For example,  .../secure/admin/EditCustomField!default.jspa?id=10701.
    

2. Create a Live Field Configuration using the above Main Script and associate it to a project, let's call it ProjX.
3. Every time we enter the issue page of the ProjX project, the MainScript.sil is executed and the customfield_xxxxx will be read-only.

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