It is always helpful to go back and remember WHY this requirement was put in place.
Con artists would target "unsophisticated" borrowers and send them a letter saying they had bought the borrowers loan and to start sending payments to the new lender. Some people did, and were in for a rude shock when they received a delinquency notice from the REAL lender. The con artists deposited the checks payable to their bogus lender, wired the money out, and then set up shop in the next town.
SO - to make sure people were not duped by this, the requirement was made that the SELLING lender and the PURCHASING lender both need to notify the borrower. Put this another way, if I got a notice on my second mortgage that you had bought my loan and that I needed to send my payments to you, my reaction would be "Not gonna happen until my existing lender confirms it."
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CRCM,CAMS
Regulations are a poor substitute for ethics.
Just sayin'