Need to copy due date to a custom "original due date" field only when "original due date" is empty

[Lorraine Gorman]

We are very new to ScriptRunner (and groovy too!).  We need to track the due date that was first entered, since it can keep changing.  So the first time a due date is entered, we want to set our custom "original due date" field to that value.  Subsequent updates to the due date should not update the "original due date" field.  I would imagine there is someone that has had a similar need.  Does anyone have a script that does this to share?

[karolina.kordos]

@Lorraine Gorman , I have managed to do this with help of this article:
https://confluence.atlassian.com/automationkb/automation-for-jira-how-to-create-a-rule-that-is-only-executed-if-a-field-was-set-from-an-empty-value-to-a-non-empty-value-1189494740.html

[Sara]

If you have Jira Misc Workflow Extensions add-on, you can directly use "Copy value from field to field (JMWE add-on)" post function on required workflow transition where you want to copy the due date to a custom "original due date" field 

In the postfunction

Source Field: Due Date

Destination Field: original due date

and check the below checkbox

Ignore empty valuesDon't set (clear) the destination field if the value of the source field is empty or null.

[Lorraine Gorman]

Thanks Laxmi.  We would like to avoid buying additional add-ons if at all possible, it can get quite pricey.  It was my understanding that Scriptrunner should be able to do this.

[karolina.kordos]

@Lorraine Gorman , where you able to solve this issue by automation maybe?