You can't - the data for a scripted field only exists after the issue has been indexed, when it is too late to write new values to the issue. So you get a null because there's nothing there yet.
You need to forget the scripted field, and calculate what would go into it in your post-function to set the actual value.
Hi Nic/ Gabrielle,
Thanks for the quick reply. I need to copy the value of the Scripted field on to the Summary.There is some value written in the Summary. So I need to overwrite it with the Scripted field value( Which depends on the data entered in the create screen). As soon as create screen is pressed I need the value in the scripted field to appear on the summary
Instead of copying the scripted, why not just add a post-function called "Update parameters of the Set Field Value to constant or Groovy expression Function for this transition."
"The value of field <custom_field> of the current issue will be set to the result of a Groovy expression (unless the field already has a value)."
This way, the value will not be duplicated.
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