Why must Konakion MM Paediatric phytomenadione 2 mg/0.2 ml not be diluted with sodium chloride-containing solutions?

Konakion MM Paediatric phytomenadione 2 mg/0.2 ml must not be diluted with sodium chloride-containing solutions because precipitation may occur, and must not be diluted before injection because incompatibilities have been observed between the diluted solution and certain siliconised syringes.