Property Registration Decree (PD 1529)
Section 87. Filing of letters of administration and will. Before the executor or administrator of the estate of a deceased owner of registered land may deal with the same, he shall file with the office of the Register of Deeds a certified copy of his letters of administration or if there is a will, a certified copy thereof and the order allowing the same, together with the letters testamentary or of administration with the will annexed, as the case may be, and shall produce the duplicate certificate of title, and thereupon the Register of Deeds shall enter upon the certificate a memorandum thereof, making reference to the letters and/or will by their file number, and the date of filing the same.