CR MAT01- Getting Error Material Type DIEN ..

Hello Expert,

Requester create a New Material only basic data with CR type MAT01 and select Material Type DIEN as mention below :

When Requester submit the CR and it goes to Approval for activate CR..

At that time Approver open the CR they got getting Error Message Service not possible; all class types excluded  ..

Any help would be appreciated.

Thanks

Nikhilesh