That is correct...Total is in 1 (actually 1a in the software form)....the sub-portion that is eligible for special tax treatment is in 1b.
1b is always part of 1a....so 1a must always be greater than, or equal to 1b.
If 1b is ever greater, then you'll get an error generated that mus be corrected.
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1200 is total (taxable) dividends....of that amount, 1000 is eligible for special tax treatment.