What is the test for establishing that the relevant facts are undisputed?

The parties stipulated and the trial court found that the relevant facts were undisputed. "Where the facts are not in conflict and the issue involves the proper application of a statute or administrative regulation, a reviewing court is not bound by the trial court's determination. [Citations.] In the case under review, the cause was submitted on stipulated facts and supplemental documentary and testamentary evidence. There was no substantial conflict in the supplemental evidence bearing upon the interpretation of the ... regulation. We are, therefore, not bound by the trial court's finding, but must make our own determination...." (Shoban v. Board of Trustees (1969) 276 Cal.App.2d 534, 541, 81 Cal.Rptr. 112.)