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BQ25601: Side effects when using ferrite bead for EMI reduction

Part Number: BQ25601

Hi Team,

My customer is suffering EMI issue on the system using BQ25601. When charging a battery with 5V with 6A, they have seen much EMI so they can not pass CISPR standard.
They've confirmed that they can pass it by adding ferrite bead at input rail of the device though, What kind of side effect will be estimated by the adding ferrite bead?
Please advice me if there are any notes with such the discrete parts around the charger.

Regards,

Takashi Onawa