How to delete ‘Requirements profile (LO)’?

Hi,

In customization (transaction PO17) I have to delete some old u2018Requirements profile (LO)u2019. I checked we are not using these u2018Requirements profiles (LO)u2019 for any object.

When I am trying to delete it system is giving message u2018First record canu2019t be deleted (time constraint 0 or 1).

How to delete these records?

Regards,