The National Council of the Croatian Democratic Union of Bosnia-Herzegovina (HDZ B-H), which gathers party officials at all levels of government, issued the statement ahead of a meeting of eight Bosnian parliamentary parties in Washington to mark the 10th anniversary of signing the Dayton agreement that ended the war in Bosnia-Herzegovina in 1995.
The Washington meeting will be a follow-up to three-day talks on constitutional changes, held in Brussels last weekend at the invitation of the US Institute for Peace.
A new constitutional arrangement should ensure three levels of government in Bosnia-Herzegovina, decentralisation of the state, equal rights for the three constituent ethnic groups, even development of the country, and respect for basic human rights and freedoms, the National Council said.
"The medium level of government cannot have fewer than three federal units which as such should have legislative, executive and judicial powers," the statement said.
It has been officially announced that at the Washington conference marking the 10th anniversary of the Dayton peace agreement, the delegation of the HDZ B-H will be headed by the Chairman of the Presidency of Bosnia-Herzegovina, Ivo Miro Jovic.
The Roman Catholic Bishops' Conference of Bosnia-Herzegovina and the leader of the New Croatian Initiative party, Kresimir Zubak, have rejected the invitation to attend the conference.