Strategic Need for ERP Customer and Vendor

Hi,

We are working on the strategy/solution whether to implement ERP Customer or ERP Vendor in MDG while we have BP.

I am not sure if the approach is correct. I need your comments/experiences.

In our ECC landscape we have SAP ERP Customer, ERP Vendor. We do not have SAP Business Partner.

Now in MDG we have BP, If I implement just BP in MDG and then do a CVI in ECC, I will be able to get the Customer and Vendor based on CVI Role Category.

So why do we implement ERP Customer and Vendor separately.

Please provide your opinions.