Quest represents users of the former JD Edwards OneWorld and World enterprise resource planning products, which are now sold under the PeopleSoft banner following its acquisition of JD Edwards in 2003.
Peoplesoft will no longer attend the group's events, amidst an ongoing feud about the extent of the software supplier's backing for the organisation.
Barbara Schmit, Quest president, said the group's work would continue. "We will try and do what is in the best interest of our members," she said.
The user group had enjoyed a strong relationship with JD Edwards that had built up over a number of years, according to Schmit. "JD Edwards had a huge participation - and we do not expect that - but we do expect some meaningful participation [from PeopleSoft]," she said.
PeopleSoft is planning an alternative user group for customers of both JD Edwards and PeopleSoft, consisting of 170 different user groups, based on specific regions, industries and products.
A PeopleSoft spokesman said the new model would offer more, and better, representation to customers and that Peoplesoft would continue to sponsor its annual Connect end-user conferences.