The issue is the version with the print engine being used, not anything you are doing incorrectly. Both PrintTool and the CustomRP use the 7.0 version of the print engine, which is why I previously mentioned a 'Crystal 8.x' feature.

If you have a copy of the 8.5 version of the CRPE32.DLL file (you will if you have Adagio JobCost), copy it to a \softrak\system\crpe directory. If you do, this will force PrintTool to use this cpre32.dll and I'm guessing your report will work. This workaround has no effect on CustomRP reports.