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How can I validate that the sum of subtotals are less or equal to the Total in an Array (Numerics)?

I have a table with 2 rows and 3 columns:
 

So what's the best option to alert to a user that the sum of Subtotal1 + Subtotal2 is greather than the Total.
I tried writing a formula but it doesn't recognize the variables, so I don't know where to start looking:
 
 
 

Hi,

Why didn't you answer the initial questions about your version, etc.?

You have to use the correct QCODES to access the cells.
As described here
[url] manual.limesurvey.org/ExpressionScript_-...code_variable_naming [/url]

You have an array(numbers). So there are two axes of subquestions
Meaning:
Total of Spotify: Q1_SQ002_SQ001
Total of Facebook: Q1_SQ003_SQ001
Subtotal1 of Spotify: Q1_SQ002_SQ008
and so on.

I always advice to use different codes for y-axis ("Y001", "Y002",...) and x-axis ("X001", "X002",...) less confusion

Furthermore your function is wrong.
Read again here
[url] manual.limesurvey.org/ExpressionScript_-...mplemented_functions [/url]

And at last: it is not a subquestion validation.
You have to use question validation and insert all rows.

Joffm