The appellate court is correct in declaring that under the parole evidence rule, when the parties have reduced their agreement into writing, they are deemed to have intended such written agreement to be the sole repository and memorial of everything that they have agreed upon. All their prior and contemporaneous agreements are deemed to be merged in the written document so that, as between them and their successors-in-interest, such writing becomes exclusive evidence of the terms thereof and any verbal agreement which tends to vary, alter or modify the same is not admissible.^[11]

Here, the terms of the subject promissory note and the deed of chattel mortgage are clear and explicit and devoid of any conditionality upon which its validity depends. To be sure, Allied Bank was not a party to SEC Case No. 2042 where the management committee was ordered created; hence, it would not be correct to presume that it had notice of the existence of the management committee which, incidentally, was still to be created when the subject promissory note was executed on 12 August 1981. Notably, while the parties in SEC Case No. 2042 agreed to form the management committee on 27 July 1981, it was only on 14 August 1981 when the committee was actually created and its members appointed. Clearly then, the subject promissory note was outside the realm of authority of the management committee. Corollarily, the chattel mortgage accessory to it is likewise valid.