Function public_credentials::migrations::update_balance_for_public_credentials

pub fn update_balance_for_public_credentials<T: Config>(
    key: &SubjectIdOf<T>,
    key2: &CredentialIdOf<T>
) -> DispatchResultwhere
    <T as Config>::Currency: ReservableCurrency<T::AccountId, Balance = <<T as Config>::Currency as Inspect<AccountIdOf<T>>>::Balance>,