How BBPUPDVD determines vendor master change in ECC?

Hi Experts,

How is the vendor master change in ECC captured and what is the strategy/check that the BBPUPDVD transaction OR vendor update report uses/does in ECC to pick up the updated vendor with qualified fields for transmission?

Qualified fields -> Purchasing block, curr change, comm method change, etc.

For e.g, if a vendor is blocked for a P.Org today and if we either execute BBPUPDVD OR vendor update job, so how does it determine the change in vendor master in ECC?

Thanks!

Regards,

Karthik