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This article explains a gives step by step instructions on how to copy the value of the next due date Next Due Date custom field into the due date Due Date field by using the COT Create on Transition app.

Instructions

The For example, following is the a custom field called "next due date"(custom field type is a date) and its value is set to 18/Dec/19.

Update Here are the steps to follow to update the post function from the respective workflow to in a workflow and copy the "next due date" value into the due date custom field by following the below steps.

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field:

1. Log in as an Administrator in into your JIRA Jira instance.
2. Select the projects Select Projects from the menu bar and click on the project name else go to the projects list and click on the . If the project is not visible from the drop-down, click on  View all projects and select the relevant project.
   
3. Click on the Project settings in the Project Page project page to administer the project project:
   
4. Go to workflows section and click on the pencil icon from adjacent to the relevant workflow scheme.:
   
5.  Click on the transition, you already set for(ex: Done) and update the post Functions, that has the Post Function to be updated. For example, Done is the Post Function
   in the below screenshot:
   
6. Click on the post Post Functions and then Click on click on the pencil icon.
   

7. Click on Detailed Fields and then set the substitutional substitution variable %original_customfield_10300% into in the Due date field. As per this post Functionsuch, when you click on the Done status in the Jira issue from the respective project, the value of the next due date will be  is copied into the Due date custom field.
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8. If you are not sure of custom field id then follow the below steps. 
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   Note: Please follow the below steps to get the next due date custom field ID
      1. Login as an Administrator in your JIRA instance.
      2. Click on the Issues from the dropdown list
           
         3.  Go to Issues from the top menu bar and click on Custom Fields
             
          4. Search for the next due date custom field and click on Cogwheel() and then click on Configure button.
              
           5.  You will see the custom Field ID from the URL.
              
           

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