More NULL variable trouble

Having some more issues with respect to NULL variables and RPG.

I've got a module level DS defined LIKEREC.  Normally, since you have to
specify *INPUT or *OUTPUT, what I'll do is that in the procedure that
actually writes/updates the file I'll have another DS defined with the
appropriate *INPUT/*OUTPUT option.  Since I'm dealing with a PF, all
columns are INPUT/OUTPUT so all the procedure needs to do is 

        EVAL LOCALDS = GLOBALDS;

Works fine, till now.  Apparently, the NULL indicators don't get updated
when EVAL'ing one null-capable DS into another.

I tried playing some games using based DS's, but that seem to really
screw stuff up.

Is there a good solution to this problem, or do I have to have either
two separate module level DS's, one defined *INPUT and one *OUTPUT, or
do I have to add a bunch of lines of code to set the %nullind of the
local DS fields according to the module level fields.

Thanks,

Charles Wilt
--
iSeries Systems Administrator / Developer
Mitsubishi Electric Automotive America
ph: 513-573-4343
fax: 513-398-1121