There was also high turnover among the Epicor workers assigned to the project, according to the suit.

The companies signed a pact in October 2009 to delay any litigation and allow time for a compromise. Epicor denied liability in that agreement, which was filed with Whaley's complaint.

ERP projects have been likened to a three-legged stool, in which the customer, vendor and integration staff must all perform well as new systems are put in place and processes updated.

A copy of Whaley's contract with Epicor, also filed with its complaint, provides details about the companies' agreement and the scope of their responsibilities.

Whaley was responsible for all system testing, although Epicor would provide testing plans and advice when necessary, according to the document.