389R4. For the purposes of sections 389R2 and 389R3, if consideration, or a part of it, for a taxable supply, other than a supply by way of sale of an immovable, made by a person in the course of activities engaged in by the person in a division or branch of the person becomes due, or is paid without having become due, to the person at a time when the division or branch is a small supplier division, within the meaning of section 337.2 of the Act, that consideration or part of it, as the case may be, is deemed not to be consideration for a taxable supply.