[gmx-users] Grompp error for graphene modeling

[‪Mohammad Roostaie‬ ‪]

Hi All,
I modeled graphene in a box of water with a peptide in the center of the box. I modified the OPLS-AA force field by adding the parameters from this link to the modified force field: http://chembytes.wikidot.com/grocnt. But, when I want to add ions to the system, I got this warning:
WARNING 1 [file ffbonded.itp, line 305]:  Overriding Bond parameters.
  old:                                          0.151 292880 0.151 292880  new: C     C       1    0.14000   392459.2
Actually, in the ffbonded.itp file, I put two parameters for C-C which the new one referes to the graphene, and, I cannot change the names in the itp file since the graphene atom names are C.Is this an important warning (May it affect the stability of the system and results)? Or may I use -maxwarn? 
Best,Mohammad