First,
In VFP 8 and later you should put ALL the fields which are not involved in aggregate functions in GROUP BY clause. That is SELECT * is not good. Are you sure you need ALL fields?
Also: The first record from that quesry defines the field length, so IIF(...,..., 0) must be:
sum(IIF(stage="70",desqty,00000000000.00)) && make these zeroes to match the length you need.
In VFP9 you could use CAST() function:
sum(IIF(stage="70", desqty, CAST(0 as N(14,2)))
Against Stupidity the Gods themselves Contend in Vain - Johann Christoph Friedrich von Schiller
The only thing normal about database guys is their tables.