Depending on the depth of the scratch and the thickness of the veneer. First rule of thumb, less is more in such matters. I would try a very fine grit sand paper (no less than 220, depending on the depth of the scratch) and use a soft rubber backed block or the palm of your hand, DO NOT use your fingers and focus on just the scratch other wise when you refinish it will be noticable. Let the paper do the work and be gentle and always sand with the grain, always gently. To get the sheen back use progressively finer grits of paper and 0000 steel wool. Talk to the manufacturer about the finish and stain (if any) used. I would imagine lacquer is what most use, faster and less labor intensive, although some may use an oil finish.
If in doubt about the above, leave it alone or let a professional look at it.
If in doubt about the above, leave it alone or let a professional look at it.