SDLP leader Mr Mark Durkan has said his party is concerned the DUP is "getting too much and giving too little" in relation to the future of the Northern Ireland institutions.
He was speaking following his meeting with the Taoiseach in Dublin.
The Taoiseach and the SDLP leader Mr Mark Durkan in Dublin today.
"The SDLP hopes that over the next few days we will see progress. Nobody is more frustrated than us at the slow pace of movement to date. "But we have to be honest. We are still concerned that the DUP are getting too much and giving too little," Mr Durkan said.
"We made clear our concerns to the Taoiseach about the lack of progress on North/South and the lack of a timeframe for the devolution of justice," Mr Durkan said.
"Above all, we expressed alarm at the proposal that the DUP would have a veto over the appointment of nationalist ministers. Peter Robinson has been telling people for a year that he has a way of stopping Gerry Kelly from being Justice Minister. This is his way.
"For the first time in our history, the Agreement gave nationalists the right to nominate their own ministers without any veto from unionism. That's equality. Now it is being diluted at the behest of the DUP," Mr Durkan said.
He
said Sinn Féin appeared not to have recognised this danger. "They [Sinn Féin] claim that it does not matter and that nationalists can veto DUP ministers in return.
"But if nationalists do that, we can be hit with suspension. That's why this new veto gives the DUP the advantage," he said.
"The SDLP refused to sign up to such a veto when the Agreement was negotiated in 1998. Indeed, had we agreed to it, there might never have been an Executive. Instead, there would have been endless rows over Martin McGuinness's appointment as Minister for Education.
"If these proposals would not have worked in 1998, I cannot see how they will work now. They are a recipe for inequality and instability."
The British government has warned that a major announcement may not immediately follow a meeting between the Taoiseach and the British Prime Minister, Mr Tony Blair, in London this week.
But a spokesman for Mr Blair said "very intensive" discussions with Northern Ireland parties were continuing, as Sinn Féin and the Democratic Unionist Party considered proposals put forward by the governments.