Create Terrain from Multiple Field Books

I seem to recall reading on this forum that there are problems creating a terrain from multiple field books.  Is this still a problem in GEOPAK v722?  Specifically I have one dgn with a single field book created from one data file, and another dgn with a single field book created from two data files.  Both dgns have been edited.  I would like to create a terrain using points from both field books while honoring each point's DTM flag (spot, spot and break, do not include, etc.)

MS v08.11.09.608
GPK v08.11.09.722