[phenixbb] ReadySet

Hi Everyone, I am having trouble refining a structure that has 2*-deoxy-thymidine-5*-triphosphate (three letter id is TTP). My PDB file has exactly the same number and names for the atoms as described in the cif file (TTP.cif). ReadySet recognizes TTP but crashes with a warning that it could match only 21 out of a total of 29 atoms. What am I missing here ? I can overcome the problem by renaming TTP to some random name and generating a new cif file with phenix.elbow but why can't I use the standard TTP.cif file ? Thanks