Which is the best approach to upload customer master data?

Hi Everyone,

I have to load customer master data  which is extracted from ecc by using generic data source(view) when i try to  trigger DTP it is showing error message  as duplicates because the customer has two sales area ,two person number and two consumernumber and four partner functions.

So i tried to make all these as compounding attributes but the length is exeeding 60 for these attributes so how can i implement this.can i implement hierarchy's?

Please give me any suggestions.

Thanks and Regards,

G.Kavyasree