How do I retreve a projected point near the intersection of a self crossing linestring

Hi, Here is my problem:  I have a road wich is a self crossing linestring that looks like a loop.  Let say that the intersection of that loop occures at distance 10meters from the start point and 400meters (the end point is at 410meters).  I have a point near that intersection in my loop that I would like to project on my road. But, my point is nearer the beginning part of the line so the function SDO_LRS.PROJECT_PT project my point on that part of the line at, let's say 13 meters from the begining.  But, I would like my point