You must specify ranges that describe the quality of a match when you add a scoping configuration.
Each scoping configuration is a collection of ranges that describe the quality of a match. The ranges encompass 0% to 100%. For example, a scoping configuration may contain two ranges that encompass 0% to 50% matches and two ranges that encompass 50% to 100% matches, for a total of four ranges. When scoping is applied to an asset, all translation memory matches are divided among the available ranges, as appropriate. There is always a category for 100% matched segments, ICE matches, and repetitions.