Two WA Department of Health officers massively exceeded their authorised expenditure limits in giving the go-ahead to changes to a centralised computing contract with Fujitsu that originally was to cost $44.9 million over four years but could end up exceeding $175 million by 2020.

In a damning report delivered yesterday, WA auditor-general Colin Murphy said the contract, first signed in November 2010 with Fujitsu to provide data centres, disaster recovery and capacity planning for WA Health's business requirements, including clinical and non-clinical applications, had seen 79 variations worth $81.4 million added, almost tripling its value in the first four years.