I don't know if anybody has come across this issue:
When defining a column as 'Carry' in an NCA setup (Phoenix 6.1 or 6.2) and the column has missing values, it is actually not carried over in the NCA results worksheets, i.e. simply dropped. This was not the case in WNL 5.x.
Other types of columns which are not carried over are probably those with very large numbers. As a source dataset, I had a SAS transport file with a numeric variable which had a DATETIME format. The SAS viewer shows this as DATE:TIME (e.g. 01JUN2011:16:24:34) but in Phoenix it shows as a very large number (e.g. 1.673957E+09). When defining this variable as Carry, it is dropped in the NCA results even if I define it as a Text variable.