The importad.sas program sets the length of filter to "$100" so you could modify that line if you need to use a longer filter:
[sas@sgmmstr ~]$ grep filter..100 /sas94/SASHome/SASFoundation/9.4/samples/base/importad.sas
length entryname $200 attrName $100 value $600 filter $100
length entryname $200 attrName $100 value $600 filter $100
[sas@sgmmstr ~]$
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