Variant Configuration: Unable to change Configuration Profile for a Materia

When I am trying to create a Configurable Material in CU42, I am unable to change the status from Locked to Released. The error msg is:

You cannot release the profile until you assign a class of class type 300

Message no. CU765

Diagnosis

You want to assign released status to the profile. However, this is not allowed until the configurable object has been allocated to a class of class type 300.

System Response

The system found that the configurable object is not allocated to any classes of this class type.

Procedure

Allocate the object to a class.

Kindly help.

Thanks and regards,

Syamala