"In Use" error when trying to unapprove or delete an asset

Issue Description

You get an error message saying that an email or landing page is in use when you try to delete or even unapprove it.

Email in use.png

Issue Resolution
If assets are being being used or referenced somewhere else in Marketo you cannot delete or unapprove them. Before you can, there cannot be anything listed under "Used By" section.

Used by tab.png

Navigate to the place where it is in use and remove it from there.

Email in flow.png

Once all asset dependencies have been removed you will be able to delete or unapprove the asset.