what is a material change
An unauthorized change of date that shortens the time of payment or extends the time of performance so that more interest will become due is a material alteration. An alteration of a signature that changes the legal effect of an instrument is material.Erasing words that show that the signer is acting as an agent, for example, changes the signer's liability under the instrument and, therefore, is a material alteration.n unauthorized change of date that shortens the time of payment or extends the time of performance so that more interest will become due is a material alteration. An alteration of a signature that changes the legal effect of an instrument is material.