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This article explains how to block creation of sub-tasks if the subtasks are already existing in the parent issue has existing sub-tasks using the Create on Transition app.

Instructions

1. Add a post-function to the intended transition , to create a sub-task.
   To add a post-function, navigate to Cogwheel > Cog wheel (Image Added) > Issues > Workflows > select , select the workflow of the project, and edit the same.
2. Select Select the Create Sub-task post function as shown below:
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3. Select the Conditions & Configuration and add , add %jql_result_count% in Condition 1 and Regular expression pattern value as "0" by marking the in Regular expression pattern, and select the Exact field under Conditions section:
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   By using the %jql_result_count% and Regular expression pattern value as "0", it checks . Use the condition and regular expression values to check for the JQL query available under the Configuration section.
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4. Add the value parent = %original_key% under the Configuration section in the JQL query.
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   It checks  It checks whether the parent issue has sub-task(s) for the specific transition and creates a new sub-task(s) accordingly.
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5. Click Update to save the settings. Verify the condition:
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6. Publish the workflow draft.
7. Perform the In Progress transition as shown. You will notice . Note that issues are created based on the condition . If and if the transition repeatsis repeated, it will does not create any duplicate sub-tasks.