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Is it a known issue whereby I cannot apply formulas to columns that have a space or number as part of the name?
For example, I have two columns QQ 1 and QQ 2
I cannot seem to use the formula QQ 1 - QQ 2, and I needed to rename the columns to QQ 1 to QQ_one & QQ 2 to QQ_two.
What is the reason behind this?