Fetching Delivery Tracking Number using BDoc from ECC to CRM

Hi Experts

is it feasible to Fetch Delivery Tracking Number using BDoc from ECC to CRM.

If feasible What is the steps involved in Fetching Delivery Tracking Number using BDoc from ECC to CRM.

However I can create/call RFC to fetch the Delivery Tracking Number from table VEKP passing the outbound delivery numb in field VPOBJKEY. But this approach causes performance issue. I am looking for the alternative approach.

Please help me to use Bdoc Approach OR use RFC approach without performance issue.

Thanks

Shaik