Answer:
1. Reporting most changes in accounting principle.
FASB ACS 250-10-45-5.
Title - "Accounting changes and Error corrections - Overall - Other presentation matters - Change in Accounting principle"
2) Disclosure requirements for a change in accounting principle:
FASB ACS 250-10-50-1 :
Title - "Accounting changes and Error corrections - Overall - Disclosure - Change in accounting principle"
3) Illustration of the application of a retrospective change in the method of accounting for Inventory :
FASB ACS 250-10-55-3
Titles - "Accounting changes and Error corrections - Overall - Implementation guidance and Illustrations -Retrospective application of a change in Accounting principle."