Oracle chief executive Larry Ellison has criticised Hewlett-Packard's board for appointing Léo Apotheker as chief executive.
Apotheker replaced Mark Hurd, who was forced to resign over alleged false expense claims and concealing a relationship with HP contractor Jodie Fisher.
Now Ellison has criticised the HP board for hiring Apotheker despite knowing he had been in charge of SAP when it was allegedly stealing Oracle's intellectual property, according to the Financial Times.
A 2007 lawsuit Oracle filed against SAP, which comes to trial in November, claims that the SAP board knew that its TomorrowNow subsidiary had engaged in systematic, illegal access to Oracle's systems.
SAP has admitted copyright and computer violations, but plans to fight Oracle's claim of $1bn in damages, arguing that the damage was only in the tens of millions of dollars.
Apotheker is expected to be called as a witness when the case goes to trial in a month's time.