R.I. Gen. Laws § 6A-1-302: Variation by agreement.

(a) Except as otherwise provided in subsection (b) or elsewhere in title 6A, the effect of provisions of title 6A may be varied by agreement.

(b) The obligations of good faith, diligence, reasonableness, and care prescribed by title 6A may not be disclaimed by agreement. The parties, by agreement, may determine the standards by which the performance of those obligations is to be measured if those standards are not manifestly unreasonable. Whenever title 6A requires an action to be taken within a reasonable time, a time that is not manifestly unreasonable may be fixed by agreement.

(c) The presence in certain provisions of title 6A of the phrase “unless otherwise agreed”, or words of similar import, does not imply that the effect of other provisions may not be varied by agreement under this section.