If the pipe connects to a nozzle, all six degrees of freedom are fixed. If we assume there is no thermal growth of the equipment, the nozzle displacements and rotations will be zero. Therefore, for the pipe that terminates at this nozzle, you would specify an "anchor restraint".

Alternatively, if this same nozzle experienced movement due to the thermal growth of the equipment, then those displacments should be specified as the boundary condition. If we assume this growth is "dx=0.3" and "dy=0.2", then the proper displacment specification would be:
dx=0.3, dy=02., dz=0., rx=0., ry=0., rz=0.

Omitting the specification of the zero values for the rotations would mean those degrees of freedom are free to rotate (which isn't the case). If there was any tendancy for the pipe to rotate, the resulting displacement report would show rotations at this nozzle, instead of zero values.