What is the test for establishing that a statement of decision is ambiguous or omits material factual findings?

"Ordinarily, when the court's statement of decision is ambiguous or omits material factual findings, a reviewing court is required to infer any factual findings necessary to support the judgment. [Citations.] This rule 'is a natural and logical corollary to three fundamental principles of appellate review: (1) a judgment is presumed correct; (2) all intendments and presumptions are indulged in favor of correctness; and (3) the appellant bears the burden of providing an adequate record affirmatively proving error.' [Citation.] [] "In order to avoid the application of this doctrine of implied findings, an appellant must take two steps. First, the appellant must request a statement of decision pursuant to [Code of Civil Procedure] section 632; second, if the trial court issues a statement of decision, 'a party claiming omissions or ambiguities in the factual findings must bring the omissions or ambiguities to the trial court's attention' pursuant to section 634. [Citation.]" (Ermoian v. Desert Hospital (2007) 152 Cal.App.4th 475, 494 (Ermoian).) "The clear implication of [Code of Civil Procedure section 634], of course, is that if a party does not bring such deficiencies to the trial court's attention, that party waives the right to claim on appeal that the statement was deficient in these regards, and hence the appellate court will imply findings to support the judgment." (In re Marriage of Arceneaux (1990) 51 Cal.3d 1130, 1133-1134 (Arceneaux).) Objections must be raised in the trial court because "it would be unfair to allow counsel to lull the trial court and

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