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(c) (i) Great care must be taken in selecting the starting point for audit testing. The test that the internal auditors performed, namely, selecting a representative sample of purchase invoices for testing to the non-current assets register and to the updating movements on the annual budget, proves merely that register and budget are in agreement with the purchase invoices issued. It is therefore not a good test to prove the completeness of purchase invoices and therefore of the entries in the register and budget. In addition, the purchase invoices are issued by many different suppliers and there is no common serial number to enable the company to ensure that all purchases are accounted for.