Make mandatory custom fields empty during creation screen when switching between issue types

[Balazs_Devay]

I want to implement a feature.

GIVEN

- custom, mandatory field (multi-select drop-down list): CMF, and

- CMF is presented on the creation screen and visible, and

- Script Runners - Behaviours is available

WHEN

- the user creates a new Jira work item, and

- the default work item (A) is selected automatically, and

- user selects a different issue type (B) on the creation screen

THEN

- the value of the CMF is reset to empty

I tried the following, but these trials all fail without throwing an exception, but UI displays the error: "We encountered an error while applying UI modifications to this form"

- CMF.setValue(null);

- CMF.setValue("");

- CMF.setValue([""]);

I also tried this but it didn't help:

CMF.setRequired(false)

CMF.setValue(null);

CMF.setRequired(true)

Please help me understand what's the proper way to reset a visible mandatory custom field to empty.

[Prasanna Ravichandran]

Hi,

Mandatory fields in Jira cannot always be reset to empty dynamically during issue creation, especially when the field is marked as required in the Field Configuration.
With ScriptRunner Behaviours, clearing a visible mandatory field often causes the UI modification error you are seeing.
A better approach is to keep the field optional during create and enforce it later using a Workflow Validator or transition screen based on the issue type/status. Hope this helps.