Hi,
I am trying to prepare a gromacs topology file for a non-natural peptide. For that I prepared a molecule.itp file and a corresponding ff***bon.itp file which contains all the bond-type, angle-type and dihedral-type.
 But, when I try to use
grompp for generating the .tpr file, it shows the following statement (But these are not 'warnings') . The following terms are atom indices and they are implying RB dihedrals.

Skip RB 204 206 208 209 (zero contribution)
Skip RB 207 206 208 209 (zero contribution)
Skip RB 207 206 208 210 (zero contribution)
Skip RB 207 206 208 213 (zero contribution)
 skip   RB 211 210 229 230(zero contribution)
But the corresponding dihedral types are present in the ff**bon.itp file.(For example 211 210 229 230 implies HB CT2 C O), But still why is it skipping those dihedrals ? previously, if it could not find any dihedral type it used to give an warning for not showing that, But In this case, it is skipping some dihedral types though they are present in the ff***bon.itp file. Can you say whether this is a serious error or it is OK?
  Thanks,
   Jagannath Mondal
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