Replicate ship to without sold-to role in CRM

Hi,

We are replicating business partners from ECC to CRM. What is happening is all Ship-to's and Bill-to's are replicating from ECC to CRM in 2 roles : one Ship-to/Bill-to and in addition Sold-to role.

Is this standard behaviour? Can we change this so that ship-to only comes in ship-to role in CRM and also Bill-to comes in Bill-to role and without additional sold-to role in CRM.

We are using CRM 2007.

Any pointers will be helpful.

Thanks

Dan