Sorting Cross table horizontal Axis


Can someone please help me with sorting horizontal axes in a crosstable. Currently my crosstable horizontal axis has values 2000/01, 2001/01,2001/02. It gets sorted in the right order if it is on the above format. But when I replace 2000/01 with a string value in custom expression part, the string valu comes as the last column in spotfire where as it should be the first column. 


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