Configuration not possible for material & specify a valid configurable material

Hi all,

I am getting the error for configurable material as:

Specify a valid configurable material

Message no. M3544

I have created a material with MMk1 , created chracterstics, and class, and assigned the chracterstics in class. I have also created profile in which I have assigned the class.

while trying to create sales order first getting the message in sales order is :

when trying to find out in MM02, getting the above error "Speicify a valid configurable material in Basic data 2.

What is the mistake I have done, please help to rectify.

Regards,

Venkat