On January 1, 2023, Xiamen Company made amendments to its defined benefit pension plan that resulted in 60,000 yuan of past service cost. The plan has 5,000 active employees with an average expected remaining working life of 15 years. There currently are no retirees under the plan.

a. Determine the appropriate accounting for the past service cost for the years ending December 31, 2023, and December 31, 2024, under (1) IFRS and (2) U.S. GAAP.

b. Prepare the entry(ies) that the U.S. parent would make on the December 31, 2023, and December 31, 2024, conversion worksheets to convert IFRS balances to U.S. GAAP.