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Whenever an issue creation is configured for the Creation on Transition post function and  This article explain how to get original issue value when a substitution variable is usedTo 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 side bar, under sidebar, select Workflows under the WORKFLOWS section, select Workflows.
3. Select your project's workflow from the right side window, the required workflow and click Edit. 
4. Click the transition for which which Create on Transition is  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 & Configuration tab  tab on the left navigation panelsidebar.

7. Enter

   the below-mentioned condition, pattern in Condition 1, Regular expression pattern fields: 

...

1. the condition, for the issue to be created, only when the condition is met as follows:
   

   Image Added

   Tip
   You must add %original_customfield name% to the condition. For example, if Pending reason is the custom field name, use %original_Pending reason%. For regular expression, give the expected value of the field. Select any of the checkboxes (Exact, Literal and Negative) as per your requirements.

   
   

2. Update the configuration and the updated post function looks as:
   Image Added
   
3. Publish the workflow before executing the transition.

The new issue is created only if the condition is met after the transition occurs.