Hi Nic,
Sorry for the late reply.
The below explanation might clear your queries.
FSCM Side:
Credit rules: Define to calculate credit limit of s customer
Risk Class: is determined automatically form the customer's score but can be changed manually. Risk class is transferred for the credit check and also controls the credit check , the credit check results as well is controlled by risk class. .Hence we need to define identical keys in SD & in SAP credit management.
SD Side: We define Risk categories as per credit control area. Different customers can be assigned to different risk categories. When you define automatic credit control ,you can determine an automatic credit check for any combination: say credit control area , risk class & credit group.
Best Regards,
Pallavi