In the case of the reduction of a deed, decree or instrument recorded in the Register of Sasines or forming a midcouple or link of title in a title recorded in the said register there shall be recorded in the said register either an extract of the decree of reduction of such deed, decree or instrument, or a title in which such extract decree forms a midcouple or link of title, and such decree of reduction shall not be pleadable against a third party who shall in bona, fide onerously acquire right to the land, lease or heritable security contained in the deed, decree, or instrument reduced by such decree of reduction prior to an extract of such decree of reduction, or a title, in which it forms a midcouple or link of title, being recorded in the Register of Sasines.