def apply_overrides(request, omap):
        """ add the given overrides (omap) to bloomberg request """
        if omap:
            for k, v in omap.iteritems():
                o = request.GetElement('overrides').AppendElment()
                o.SetElement('fieldId', k)
                o.SetElement('value', v)
add the given overrides (omap) to bloomberg request