The audit manager is reviewing the audit plan prepared by the team leader for the audit of the trade receivables balance. In an attempt to be more efficient the team leader has suggested that more than one assertion can be covered by the same audit procedure, as shown below: Obtain a breakdown of the items from the trade receivables balance. Take a sample of items from this and perform a positive receivables circularisation, agree the responses to the breakdown of the trade receivables balance (existence; rights & obligations; accuracy, valuation & allocation; completeness). As part of this exercise customers were asked to confirm that they intend to pay the amount owed. For each of the assertions listed above explain whether the proposed substantive procedure is appropriate. If it is not, then suggest an alternative substantive procedure that would be appropriate for that assertion