AGING see ACCOUNT AGING.
ACCOUNTING PRINCIPLES BOARD (APB) OPINIONS were published by the Accounting Principles Board (APB). The APB was created by American Institute of Certified Public Accountants (AICPA) in 1959; replaced by Financial Accounting Standards Board (FASB) in 1973. The APB mission was to develop an overall conceptual framework of US generally accepted accounting principles (US GAAP). APB was the main organization setting the US GAAP and its opinions are still an important part of it.
DUN is when you importune (beg or are insistent upon) a debtor for payment: a dunning letter.
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