Job Requisition: add text box content by using page composer

Hi all,
I'm trying to add a text box by using Page Composer tool in Job Requisition creation page.
Starting from an Existing Requisition, in order to have all fields populated (above all the mandatory ones), I'm meeting anissue
When trying to activate Page Composer the system alert me as

However all fields are entered and "Other Location" and "Other Work Location" were hidden…
Any suggestion?

Thanks in advance
Tommaso