I have a lookup formula to find the smallest date in a column or more
specifically a range (SUB_102). The forumlua is correctly finding the
smallest value, however when it looks in the non contiguous range the
forumal errors out. I have the same problem if i define the cells
explicitly instead of using a range. I am using a non contiguous range
in order to exclude a summary cell throughout the column.

In the end this formula should find the smallest date in the range and
return the letter found in column A of the same row. Anyone know how
to make this work?

Thanks.

------SUB_102 range source------
=Worksheet!$U$2:$U$16,Worksheet!$U$18:$U$29

------Cell formula------
=LOOKUP(MIN(SUB_102),SUB_102,Worksheet!A:A)