Updating Position Hierarchy

Summary

Flattening the position hierarchy.

Content

Hi All,

We are implementing position management and I was playing around with position hierarchy. I have understood the concept but this is something mentioned in the implementation guide which says,

"You can only correct the HCM position hierarchy. You can enable or disable the position hierarchy configuration by flattening the existing hierarchy. You must run the Synchronize Person Assignments from Position process to flatten the position hierarchy. "

What does flattening the existing hierarchy means here? I know the guide is talking about the checkbox in the manage enterprise HCM task .

Can anyone throw some light here.