Client: Pinnacle Manufacturing
Audit Area: Tests of Controls and Substantive Test of Transactions–Acquisitions.
Define the Objective(s): Examine vendors’ invoices, receiving reports, purchase orders, and other related documents
to determine whether the system has functioned as intended and as described in the audit program.
Define the population precisely (including stratification, if any): Vouchers from 1/1/2016 to 10/31/2016.
First voucher number – 6734. Last voucher number – 33722.
Define the sampling unit, organization of population items, and random selection procedures:
Voucher number, recorded sequentially in the acquisitions journal; random number function in electronic spreadsheet.
Calculated
Sampling Error
(TER-SER)
Evidence of internal
verification of voucher
package including propriety
of purchase, dates, unit
costs, prices, extensions,
footings, account
classification, recording in
journal, and posting and
summarization. (6a, b)
06% 10% 30 30 2 6.7% -0.7%
2.
Prices on vendors’ invoices
conform to approved price
limits established by
management. (6c)
05% 10% 40 40 0 0.0% 5.0%
3.
Price times quantity and
other calculations on the
vendor’s invoice are correct.
(6d)
1% 5% 10% 50 50 0 0.0% 5.0%
4.
Evidence of proper account
classification on vendors’
invoices. (6e)
2% 5% 10% 70 70 0 0.0% 5.0%
5.
Dates on entries in
purchases journal agree with
dates on receiving reports.
(6f)
1% 5% 10% 50 50 2 4.0% 1.0%
6.
Evidence of internal
verification of each purchase
voucher. (6g)
06% 10% 30 30 0 0.0% 6.0%
Results: based on the results of the tests, all controls appear effective except for evidence of internal verification. Since there were also
two errors on timing and and error in comparing the vendor’s invoice amount to the acquisitions journal that is not included as an attribute,
a larger than normal sample in year-end testing of accounts payable is appropriate.
Notes: 1. The planned audit variables are judmental. The results of the prior year from part III were used to decide EPER. Initial sample size and CUER are judgments.
2. There was an error discovered where there was no attribute. This happens in practice too. The auditor should not ignore the exception even though it is an unplanned discovery.
Description of Attributes