Review SAS DOC for the WHERE statement - there are no suitable observation candidates in WORK.convert having the condition/expression called-out on the WHERE statment.
Suggest analyzing your input file, possibly using PROC FREQ, PROC PRINT, or you may also consider self-diagnosis with the WHERE statement and using a LIKE construct in order to learn more about your input, such as case-sensitive tests in the WHERE.
Scott Barry
SBBWorks, Inc.
Suggested Google advanced search argument, this topic / post:
data step programming +"where statement" +pdv site:sas.com