Bussiness Partner: Mass upload from ECC to S/4 hana

Hi Friends,

We are migrating BP data from ECC to S/4 Hana.
In S/4 Hana the Transaction XD01/XK01 is obsolete, so we need to create master data through Transaction BP only.
Most of the blogs on this topic are having BP, Vendor/customer no. to be the same.
But in my case, those two should be of a different number range.
So want a BAPI having provision to upload the BP, Vendor numbers.
Note BAPI_BUPA_FS_CREATE_FROM_DATA2, BAPI_BUPA_CREATE_FROM_DATA are not working for the above requirement.