Negative slip adjustments via activity/task code-2017

We previously were using Timeslips 2011 and used one task/activity code set to negative 50% which automatically took care of all the affected slips.  We just upgraded to 2017 and had a consultant upgrade our database.  This feature no longer works with a negative number, only positive now.  I even tried it in the sample database with similar results.  Was this feature removed at some point between 2011 and 2017?  Thank you.