Core Viewpoint - Kirin Xin'an, known as the "first domestic operating system stock," has adjusted its bad debt provision method for accounts receivable from its largest client, A1 unit, which has raised concerns from the stock exchange [1][2]. Financial Performance - As of the end of 2024, Kirin Xin'an reported accounts receivable of 4.06 billion yuan, with 2.23 billion yuan owed by A1 unit, accounting for 55% of total receivables [2][3]. - The company achieved operating revenue of 286 million yuan and a net profit of 7.94 million yuan in the previous year, indicating significant growth [1]. Accounts Receivable Details - The accounts receivable from A1 unit originated from sales made in 2021 and 2022, and as of now, these amounts have not been collected [1]. - The bad debt provision for A1 unit was changed from a combined provision method to an individual provision method, with a bad debt loss amounting to 60.78 million yuan, representing a provision rate of 27% [2][4]. Client Relationship and Sales History - A1 unit was the largest client from 2019 to 2022, with sales figures of 625.02 million yuan, 1.03 billion yuan, 1.44 billion yuan, and 1.65 billion yuan, each accounting for over 40% of Kirin Xin'an's revenue during those years [3]. - In 2023, revenue from A1 unit dropped to zero, but the company continues to provide technical support and maintenance services [3][5]. Change in Provision Methodology - The change in bad debt provision methodology was influenced by the aging of accounts receivable, with 1.81 billion yuan being 2 to 3 years old and 417.98 million yuan being 3 to 4 years old [4]. - The company opted for individual provision to reflect the credit risk more cautiously, as the aging structure of A1 unit's receivables significantly differs from other clients [5].