PPM: Tasks saved in OWB automatically become Milestone

Document ID : KB000122211
Last Modified Date : 03/12/2018
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When save Task which has same Start and Finish date in Open Workbench,  it becomes Milestone automatically.
Why Open Workbench changes Task to Milestone?
If task is defined with Duration=0 and Fixed is selected, it will be Milestone.

Replication steps:
1. create task with duration 1 day and define same date for start and finish.
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2. change Duration 0 day and turn on Fixed checkbox.
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3. save and task will be changed to Milestone.
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