for(boost::tie(iedge_s,iedge_
end) = boost::in_edges(v,g); iedge_s!=iedge_end; ++iedge_s)
{
    Vertex src = boost::source(*iedge_s,g);
    Vertex target = boost::target(*iedge_s,g);
   cout << g[src]->id << "-->" << g[target]->id << endl;
    EdgeProperties *ep = g[*iedge_s];     // <==== Line 10; g[*iedge_s] is returning null

    cout << ep->sourceI << endl;         //        <====   This is giving segmentation fault;
}

**here g[*iedge_s] is returning null**
is it the problem because iam using (*iedge_s) as (edge_descriptor) or
the problem somewhere in my code where in i had not properly assigned the property object
to that specific edge.

Any kind of edge iterator (in, out, etc.) dereferences to an edge descriptor, so you're not missing anything. You're not actually modifying the edge set in that loop are you? That will cause some serious problems. Otherwise, it looks like you may have missed an initialization.