Regional Jet 700 ER/LR (CRJ700)
Training / Qualification; Confusion
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Separated Traffic
Human Factors
PDC stated:  -OOM2 PXV-FMS route installed:  OOM2; PXV as filedOn the departure on the OOM2; ATC asked if we were 'direct PXV?'  We responded affirmative OOM2 'direct PXV'.Memphis Center later on gave us a number to call IND Center to once we landed.The cause of the error on the routing in our FMS came from the translation and duplication of what was on the PDC which was verified by both pilots.  The PDC was understood and viewed as OOM2 direct PXV.It would be nice in the future if the PDC was more explicit rather than vague and showed that V305 needed to be flown in between the SID identifer and the next fix shown.  It is not as straight forward as it could be.
If a transition is anything other then direct after the SID identifier; the next fix should be put in the PDC. If in this case the PDC had shown 'Route -OOM2-V305-PXV-' there would be no question as to what the clearance was; and the PDC and FMS (our routing); would match.
A CRJ7 crew given a PDC clearance of OOM2 PXV..  fly direct PXV after OOM thus missing the WEGEE FIX.  Crew is requested to call ZID on arrival in which ATC asks why they deviated from the SID route to PXV.