Last updated: before December, 1998
v3.0* allows for a maximum of 30 levels of imbedded IF's e.g.:
FIELD1=IF(x,a,IF(y,b(IF z,c,IF...
To get around this, simply use additional formulae, e.g.:
FIELD1=IF(x,a,IF(y,b(IF z,c,FIELD2)))
FIELD2=(IF(x1,a1,IF(y1,b1,IF(z1,c1...)))