It is lawful for any lien creditor to record a certificate of partial satisfaction of any one or more of the separate pieces or parcels of property covered by such lien. It shall also be lawful for any such creditor to record a certificate of partial satisfaction of any part of the real estate covered by such lien if a plat of such part or a deed of such part is recorded in the clerk’s office and a cross-reference is made in the certificate of partial satisfaction to the book and page where the plat or deed of such part is recorded. Such certificate of partial satisfaction may be accomplished in manner and form prescribed in this chapter for making certificates of satisfaction, except that the creditor, or his duly authorized agent, shall make an affidavit to the clerk or in such certificate that such creditor is at the time of making such satisfaction the legal holder of the obligation, note, bond, or other evidence of debt, secured by such lien, and when made in conformity with the provisions of this chapter such partial satisfaction shall be as valid and binding as a proper release deed duly executed for the same purpose. Any and all partial marginal releases made prior to July 1, 1966, in any county or city of the Commonwealth, in conformity with the provisions of this chapter, either of one or more separate pieces or parcels of real estate or any part of the real estate covered by such lien, or as to one or more of the obligations secured by any such lien, or as to all of the real estate covered by such lien instrument, are hereby validated and declared to be binding upon all parties in interest, but this provision shall not be construed as intended to disturb or impair any vested right.