Existence of course of business when relevant is discussed in:
Explanation & Strategy
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Section 14 BSA allows courts to infer that an act was done in a particular way by proving that it was the routine course of business to do it that way. For example, proving that a letter was posted can be supported by evidence that the office regularly posted letters by the same method. This section corresponds to Section 16 of the old Evidence Act and is commonly used in banking, commercial, and insurance cases.
The text reads: Section 14 BSA: When there is a question whether a particular act was done, the existence of any course of business according to which it naturally would have been done is a relevant fact.
BSA S.14 corresponds to Evidence Act S.16 with substantially the same content; section numbers have been reorganized.