Hi HBT,
if you have only one Backend - no problem
Standard SRM Customizing for Business Partners looks like (Transaction SNRO, Object BU_PARTNER):
So, your interval 02 should already have attribute "External"
Then you should use BBPGETVD with following parameter.
Your vendors will be transferred with R3 numbers. Mapping is saved in the table VENMAP.
Regards
Konstantin