Overlapping conditioned Subfile fields

Can this be done?

Basically I have a subfile containing Header and associated Detail lines.
I want to Display SKU, Description & Free Stock when displaying the Header
and
Order#, Customer Code, Qty etc at detail level however the conditioning of
the fields
using DSPATR(ND) doesn't seem to work?  I seem to recall this being a
problem years
ago but can anyone confirm.

Tempted to use a single subfile field and populate it via a Data Structure
dependant upon Header
or Detail?

Code Snippet:

        ITEMS1           15A    O 6     7TEXT('Item Code')
N40                                            DSPATR(ND)
        ITDSS1            30A    O 6   25TEXT('Item Desc.')
N40                                            DSPATR(ND)
        FREES1              9S    O 6   60TEXT(Free Stock')
N40                                            DSPATR(ND)

        ORDNS1            7A    O 6     7TEXT(Order #')
      40                                            DSPATR(ND)
        CUSCS1            10A   O 6   16TEXT(Customer')
      40                                            DSPATR(ND)
        OQTYS1              5S   O 6   30TEXT('Order Qty)
      40                                            DSPATR(ND)

Thanks In Advance.