Hi Eric, I don't see the answer you are referring to but let's see if I can sort this out for you.
Maybe you are referring to PMI and BPO? PMI is private mortgage insurance and is an insurance policy paid for by the borrower OR the lender that insures the lender against loss related to a mortgage. For example: You buy a house for $100,000and finance the entire purchase. The lender, will probably require that an insurance policy (PMI) be place don the loan to cover 20% of the mortgage amount or $20,000. If you default the PMI is responsible to pay up to 20% or $20,000. This is the reason they have a say so in whether or not a "short sale" can be accepted.
BPO is "broker price opinion" and is basically an opinion of value of a particular property given my a licensee or broker. Lender use BPOs to price pre foreclosure and foreclosure properties.
I hope this helped to answer your question