This problem analyzer identifies if the
TASK.WHAT_NAME field is present in your XML to prevent you deploying deprecated metadata.
What triggers this problem analyzer?
If any of the layouts you are deploying contain the
TASK.WHAT_NAME field (see example below).
You'll see a message prompting you to remove references to this field.
What problem is it solving?
TASK.WHAT_NAME filed has been deprecated by Salesforce, so chances are your target org won't support it any more.
How does it work?
If you accept the suggested fix we'll remove that field from the XML and deploy the rest of the layout for you.