Test systems provider Ixia will restate financial statements for four fiscal years because customer support and maintenance obligations had not been properly accounted for, the company announced. The Calabasas firm also notified the Securities and Exchange Commission of a late filing of its financial report for the quarter ending Sept. 30. A review of accounting practices found that the company may have implied post-contract support and maintenance obligations extending beyond the company’s standard post-contract support period. The financial reporting periods to be restated are the year ended Dec. 31, 2003; the year ended Dec. 31, 2004 and each quarter for that year; the year ended Dec. 31, 2005 and each quarter for that year; and the quarters ended March 31, 2006 and June 30, 2006. Because of the restatement, the financial numbers reported for those years and quarters should no longer be relied upon, the company said.