N.D. Cent. Code § 41-01-22: (1-308) Performance or acceptance under reservation of rights

1.A party that with explicit reservation of rights performs or promises performance or assents to performance in a manner demanded or offered by the other party does not thereby prejudice the rights reserved. Such words as "without prejudice", "under protest", or the like are sufficient.

2.Subsection 1 does not apply to an accord and satisfaction.