Can't assign authorization group in Categories of the Hierarchy

Hello,

I've downloaded materials from R3 to CRM. I've created hierarchy R3PRODHIER and other categories and hierarchies that middleware need. Now, I want to restrict products by sales organization, and for that I need to fill Authorization Group field  in the category (in COMM_HIERARCHY transaction, double-clicking R3PRODHIER hierarchy, navigate to u201CCategories of the hierarchyu201D. Then select a category and, in u201CProduct / Object Maintenance: Control fieldsu201D block, there is the u201Cauthorization groupu201D field), in order to use COM_PRD_CT authorization object

When I tried to edit the category in CRM, I´ve got the following message: "Hierarchy R3PRODHIER may only be changed in the original system ED1CLNT100"

I understand this message is because the source system for my products is R3. The question is: how can I assign an authorization group to the category? Is it in R3? I can´t find any place to assign it in the customizing

Please help

Regards