First, please turn off your caps because it's the same as
yelling at people for no good reason.

Data validation has two main purposes. One is to enter
valid data in a cell, another is to ensure only valid
entries are made if you manually type them in. Because of
the first part, if you tried using data validation on a
cell with a formula, you could easily overwrite the
formula with one of the allowed values. Therefore you
can't use data validation directly on a cell containing a
formula and expect it to work. You can only use data
validation to validate data. Data is raw information, not
a formula. You could use data validation on the cells
that are referenced with your formula.

-----Original Message-----
HOW CAN I USE DATA VALIDATION IN CELLS WITH FORMULA
.