Co-signing (or co-witnessing) is performed after the second level of review is finished – e.g. after technical lead reviews and signs the task, the co-signing is done by the project manager as well.
To co-sign a task navigate to previously signed task and click the Co-sing task button.
A new window will prompt you to input your user credentials and optionally write the reason for co-signing in the Comment field.
After clicking Sign and verify task the task will be co-signed and locked. The co-signed task can only be unlocked by the same user that has Co-signed it.