Our simulations are in agreement with the experiment and explain the sensitivity of the RIXS spectra to the symmetry of the XA resonance by different screening or electron-hole interaction. We have shown that the so-called spectator shift of the RIXS spectra is larger for the |F 1s -1 6a 1 1g resonance than for the |F 1s -1 6t 1 1u , |F 1s -1 7t 1 1u , and |F 1s -1 2t 1 2g XA resonances. The reason for this is that the 6a 1g unoccupied molecular orbital being more localized on the F atoms results larger screening of the core-hole and hence larger spectator shift.