MM02 with material type

Question: Hello,
I searched in the forum, but I did not find my answer

I want to authorise 1 user, to modify material (MM02) for only 1 material type (VERP).

1)
I modified in OMS2 for material type VERP : I added Authorization group "VERP"

2)
I created a role with object
S_TCODE = MM02
and M_MATE_MAR = "VERP"
and ACTIVITY = "02" & "03"

3)
I affected this role to the user (only this role).

But it does not work, this user can always modify all material type. What I forgot ? It's urgent ... I don't understand.

Answer:
did you also add the same valeu in M_MATE_MAT?

Answer:
OK, I found a solution now...
I must creat a authorization group for all material type (and not only for type VERP)... It's work now !

thanks!!!
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