Purchase Order required fields

Purchase Order required fields

Ive added some custom fields to my PO. IS there any way to make them mandatory so that the PO requester HAS to fill in these additional fields.
 
Second question alos about PO reporting, is there any way when running PO reports that I can get it to list in the report  the item information, this does not seem to be available to choose as an option when creating a custom report on POs.
 
Thanks

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