AJ bought a used cell phone from JR. JR preferred cash but AJ is a friend so JR accepted AJ's promissory note for P10,000. JR thought of converting the note into cash by endorsing it to his brother KR. The promissory note is a piece of paper with the following hand- printed notation:AJ WILL PAY JR TEN THOUSANDPESOS IN PAYMENT FOR HIS CELLPHONE 1 WEEK FROM TODAY.

Below this notation AJ's signature with 8/1/2020 next to it, indicating the date of the note. When JR presented AJ's note to KR, the lattersaid it was not a negotiable instrument under the law and so could not be a valid substitute for cash. JR tookthe opposite view, insisting on the note's negotiability. You are asked to referee. Which of the opposing views is correct?