Hello Vijay,
You can find the Vendors in table LFA1. Your Business Partners are in table BUT000.
The number ranges transactions are as follows: Vendors - XKN1, Business Parners - BUCF
You should check the NR Status and make sure your value is greater than the last created LFA1 record, so your PPO does not fail (that's in case you're going the direction BP -> Vendor and don't have the "Same flag" active in view V_TBC001). If you are trying to synch up from Vendor to BP, you'll have to check the view CVIV_VEND_TO_BP1 instead.
Hope that helps,
Boris