I have a worksheet, "Source List," that is copied from a database into Excel.
Column O lists customer codes; other columns identify associated data (name,
badge#, etc.) of employees that work with that customer.

I have another worksheet, "Profile." Column A lists the same customer
codes; column F contains SUMIF formulas extracting data from the Source List
identifying the number of employees working for that customer.

The problem is that formulas for some codes result in "0," when in fact
there are employees working for that customer. If I manually type over the
code in column A (without changing the formula), the formula reads properly,
.. I changed the cell/column format to "text" on both Source List and Profile
worksheets -- to no avail.

Why isn't the formula reading the customer code?

Hope I'm clear on this .... thanks