Configurable Material

Dear Experts,

I have filled a Confugurable Material in the 'Config data' Tab of an Equipmnet Master .

Further when I try to assign values by clicking on 'Maitain' push button an information triggers, which says:

Config. not possible for config. material .......(reason: 6)

What is to be done and where/ (Any customisation issues)

Please help

Regards

Jogeswara Rao