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Whenever trying to get original issue value for a new issue creation that is configured for the Creation on Transition post function, need to use the substitution variable.This article explains how to get original issue value along To get the original issue value when a new issue is created configured using Creation on Transition post functions, substitution variables are required. This article explains how to get the original issue value with a condition applied to a substitution variable.

Instructions

1. Log into Jira as a Jira an Administrator and click navigate to Image Modified > Issues Issues.
2. From the left sidebar, select Workflows under the WORKFLOWS section, click Workflows.
3. Select your project's workflow from the right side window the required workflow and click Edit. 
4. Click the transition for which Create on Transition is configured.
   
5. Go to Select Post Functions and click Image Removed to clickImage Added to edit the Create Issue post function.
   Image RemovedImage Added
   
6. Select the Conditions the Conditions & Configuration tab Configuration tab on the left navigation panelsidebar.

7. Add Enter the below mentioned condition, for the issue to be created, only when the condition is met as follows:
   

   Image RemovedImage Added

   Tip
   Need to add %original You must add %original_customfield name% to the Condition condition. For example, if ' Pending reason ' is  is the custom field name then , use %original_Pending reason%. For regular expression, give the expected value of the field. Also, select the required checkbox like Select any of the checkboxes (Exact, Literal and Negative to match ) as per your requirements.

   
   

8. Update the configuration and the updated post function looks likeas:
   Image RemovedImage Added
   
9. Publish the workflow before executing the transition. You will see that a

The new issue is created only

...

if the condition is met after the transition occurs.