Comment on your ability to trace the different types of entries in the Wichita Suppliers account to source entries in Pannell's journals using the reference identifiers given. Which of the reference identifiers are for documents prepared by Pannell? By Wichita Suppliers? What suggestions do you have to improve the quality of the audit trail?

$10.$ Some accounting transactions have source documents whose preprinted numbers can be used effectively as audit trail reference identifiers. The preprinted number on other source documents evidencing transactions cannot be so used.

Required:

a$.$ Identify those document identifiers that are useful components of an audit trail.

b$.$ Identify other common document identifiers that are not.

c$.$ What two characteristics do useful reference identifiers possess?