Link between Characteristics and Material Groups

Hello all,

I work in a company which uses the procedure with classification for the purschase requisitions. It works with the classe ZN_MM_VAL_DA.

As Characteristics in that classe, there is ZN_GRP_MARCH_CODE_FAMILLE.

I set up values in that characteristics. Those values are used to define the purchasing requesition procedures. They appear in the set up of the procedure, but nothing are linked to that characteristics.

Now; I want to link a material group I have created with that characteristics, in order that I can set up a purchasing requesition procedure with my material group. But I can't manage to do it !

Can someone help me to set up my link between my characteristic and my material group ?

Thanks !

Mathieu