I need at least four examples where the Council of European Union
http://www.consilium.eu.int/ decision was changed by a change from one
or more of the member states (for reasons such as wrong uderstanding
of vote by the Council president, wrong information at the B-item
debate) AFTER a political agreement has been reached useing a
Qualified Majority Voting
http://en.wikipedia.org/wiki/Qualified_Majority_Voting but BEFORE
formal approval of the political agreement in a A-item vote.
I pay 3 USD per example.

The Balance between Small and Large: Effects of a
     Double-Majority System on Voting Power in the European
     Union

Author(s):	     Madeleine O. Hosli
Source: 	     International Studies Quarterly, Vol. 39, No. 3. (Sep.,
		     1995), pp. 351-370.

I found this Article in JSTOR--There are some examples of different
decisions toward the end, though I am not sure they meet your
criteria.