It should be fine, loads of people use the profec b with the power fc.
A few questions:
1.Who was doing the mapping and are you confident they know what they're doing.
2.Were they doing it on rollers or road or both
3.Does the fault show any symtoms
4.What's the spec of the car
5.What boost are you running
I actually use the profec b with the power fc and run 1.7 bar and all is ok.