Ok button solved. You need to delete the extra red rows.
(I didn't create them, they were there the first time I opened the Edit dialog)
After a nights sleep I realized NAD83_to_CSRS is the wrong selection for the NRCAN ntv2 files, they're meant for NAD27 to 83 transforms. However when I went to add it to NAD27_to_NAD83_Canada_FME instead I discovered the grid shift file was already there and set!
It would be nice if http://docs.safe.com/fme/2019.0/html/FME_Desktop_Documentation/FME_Workbench/CoordSys/Included_Grid_Shift_Files.htm were updated to reflect this. (The page does currently say NAD27<->NAD83 grid shift files are included, but doesn't say they are NTv2.)
After a nights sleep I realized NAD83_to_CSRS is the wrong selection for the NRCAN ntv2 files, they're meant for NAD27 to 83 transforms. However when I went to add it to NAD27_to_NAD83_Canada_FME instead I discovered the grid shift file was already there and set!
It would be nice if http://docs.safe.com/fme/2019.0/html/FME_Desktop_Documentation/FME_Workbench/CoordSys/Included_Grid_Shift_Files.htm were updated to reflect this. (The page does currently say NAD27<->NAD83 grid shift files are included, but doesn't say they are NTv2.)
Hi @maphew: I'm sorry that it would have saved you time if we included the NTv2 info in the documentation. I've logged a request to our publications team about this suggestion. Thanks for your input!