BERLIN (Reuters) - Germany s would-be coalition partners have not agreed to abolish a tax imposed after reunification to help poorer eastern states, a conservative politician told Reuters on Sunday, retracting his previous remarks that a deal on the issue had been reached. Hans Michelbach, a member of Chancellor Angela Merkel s conservative bloc, said earlier that an agreement had been reached with the Greens and the pro-business Free Democrats (FDP) to abolish the  solidarity tax  by 2021. The FDP had made abolishing the tax, which was due to expire in 2019, an election promise. 