Had same issue. This worked....
STEP 1:
Commented out these two (2) lines in
/opt/splunk/etc/apps/TA-websense/default/props.conf
#REPORT-1category_id_for_websense = category_id_for_websense
#FIELDALIAS-category_for_websense = category_id as category
STEP 2:
Added this local/props.conf file:
/opt/splunk/etc/apps/TA-websense/local/props.conf
[source::...websense]
sourcetype = websense
[websense]
SEDCMD-setcatid = s/category=/category_id=/g
LOOKUP-websense-categories-list = websense-categories-list WID AS category_id OUTPUTNEW Wcategory AS category
(NOTE: The columns in my CSV were "WID" and "Wcategory")
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