Un travail de compilation et de tableaux récapitulatifs préparés par un témoin peut être admissible en preuve à la condition que les documents compilés soient mis en preuve et que le défendeur ait eu l'occasion de contre-interroger le témoin

Regina v. Scheel, 1978 CanLII 2414 (ON CA)

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We are all of the view that the summaries, based on evidence which had been properly admitted, were admissible to assist the jury in understanding the entire picture represented by voluminous documentary evidence. The usefulness of the summaries depended entirely, however, upon the acceptance by the jury of the proof of the facts upon which the summaries were based. 

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In McDaniel v. United States (1965), 343 F. 2d 785 (5th Cir.,C.A.), Hunter, . District Judge, delivering the judgment of the Court, said at p. 789: 

The rule is that a summary of books and records is admissible, provided cross-examination is allowed and the original records are available. Here, the records of which the exhibits are summaries were in evidence and the man who prepared them was available for cross-examination ... It is perfectly proper that litigants be permitted the use of illustrative charts to summarize varying computations and to thus make the primary proof upon which such charts must be based more enlightening to the jury. The district judge did not abuse his discretion by permitting the use of these summaries. 

I would also observe that in the present case the summaries were helpful to the appellant, with respect to some of the counts.