12 Further, it seems to me that this proposition was founded on an error which infected the submissions of both the appellant and the respondent. The availability of s 24 does not have the effect of transforming the relevant sections of the Act from a duty to "ensure" into a duty to take "reasonable steps to ensure". Rather, in order for a defence to be available there must in each case be evidence of an honest and reasonable mistake with respect to a particular transaction. It appears to me that this can either be based upon a memory of the actual circumstances of the transaction or, as cases such as Geraldton Fishermen's Co-op demonstrate, upon the existence of a system which gives rise to such a belief. Where a system exists, it must be a system which is capable of giving rise to a belief that in the particular case in question, the provisions of the Act have been complied with. I do not see how such a belief can arise based merely upon a system which is sufficient only to found a reasonable belief that mistakes will be minimised, or will not usually occur, or will usually occur only in a small number of cases. A belief of that kind cannot, it seems to me, found a belief that in any particular case the requirements of the Act have been complied with; rather, it can only found a belief, at best, that it is probable that the requirements of the Act will have been complied with. This, in my view, is placing a gloss on the words of s 24.