Exactly how are you "importing data" - using SAS wizard, PROC IMPORT, or a DATA step that you coded? Also, what determines the DATA step INFILE statement (or SAS FILENAME) to setup the "fileref" to your input data?
Suggest you share more about your actual current SAS program execution code, preferably as a forum post/reply and paste your SAS generated log output, in addition to explaining the relevant points above.
Scott Barry
SBBWorks, Inc.