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Once user or users are determined this step behaves the same as User step
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Resolve user
There are two options that allow you to reveal the approver,
Approval start
Step start
If the “approval start” option is selected, the approver will be revealed as soon as the the approval starts, (in the event of the approver missing from the issue field, this step will be skipped or definition will not be created).
Step start option, however, will only reveal the approver once the path has reached to the step.
Once the approver is determined this step behaves the same as User Step.