Perhaps you might test with the option FLOWOVER instead of MISSOVER.
Consider this brief example:
data junk;
infile datalines flowover;
input a $ b $ c $;
datalines;
a b c
1 2 3
p d
q
4 5
6
;
run;
To see if the data is a reasonable substitute for yours and the result makes sense.
Of course if you may lots of other missing data then this won't work but if MISSOVER was included as a default coding item it is worth testing.
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