Proposal using double dispatch to call domain service within a single operation

Proposal.cs

public class Proposal : Aggregate
{
    public void Accept(IDomainService domainService)
    {
        ChangeStatus(ProposalStatus.Accepted);
        base.EventsRaised.Add(new ProposalAcceptedEvent(proposal.Id, proposal.AcceptedAt))
        domainService.DenyOtherCompaniesProposals(this);
    }
}