Why is restriction "Authorization Group for Product Type" is empty ?

[SAPSupport]

Why aren't the product types shown in the field "Authorization Group for Product Type" when maintaining restrictions for the Product Master catalog SAP_CMD_BC_PR_MAINT_PC ?

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[SAPSupport · Accepted solution]

The KBA 3203535 - Not possible to maintain values for restriction types 'Authorization Group for Product' an...explains how the values for the field Authorization Group for Product Type are determined.