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I using BDS2006 and stl to writing my code, but the following code
report an strange compile error message:
[C++ Error] Unit1.cpp(43): E2024 Cannot modify a const object

Test Code:
#pragma hdrstop
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <set>
#include <utility>
using namespace std;

//---------------------------------------------------------------------------

#pragma argsused

struct SNegativeBill
{
int ServID;
int RealFee;
};
typedef struct SNegativeBill SNegativeBill;

struct CompareServIDFunctor
{
bool operator()(const SNegativeBill &Item1, const SNegativeBill
&Item2) const
{
return (Item1.ServID < Item2.ServID);
};
};
typedef set<SNegativeBill, CompareServIDFunctor> SNegativeBillSet;
typedef pair<SNegativeBillSet::iterator, bool> SRetCode;

int main(int argc, char* argv[])
{
SNegativeBillSet ServIDSet;
for (int i = 0; i < 10; ++i)
{
SNegativeBill BillItem = {0};
BillItem.ServID = i;
BillItem.RealFee = i + 100;
SRetCode RetCode = ServIDSet.insert(BillItem);
if (!RetCode.second)
{
RetCode.first->RealFee += BillItem.RealFee;
}
}

return 0;
}
//---------------------------------------------------------------------------

as help file say, the insert function:
pair<iterator, bool> insert(const value_type& val);
It is possible BDS2006 BUG?