Employed learners on Universal Credit - Full Funding/Unemployed?

I know I read something about this some time ago, but I can't find anything which explains my query exactly. 

What is the point of this bullet point under the defenition of "Unemployed"?

• receive Universal Credit (UC), and their take-home pay as recorded on their UC statement (disregarding UC payments and other benefits) is less than £617 a month (learner is sole adult in their benefit claim) or £988 a month (learner has a joint benefit claim with their partner)

Our MIS report that the ILR returns an error if there is a recording of employed, in receipt of UC but no declaration under the requirements for Low Wage. But surely the bullet point above is 100% clear...if the earnings are below £617 we don't need to see evidence via the low wage route - it is self declaration. 

In the particular instance in question the learner has ticked working 11-20 hours. If they work 11h at minimum wage, that's =11h x £10.42 x 4.3 weeks per month = that's £492.87, which although gross is still well below £617. They'd thererfore have to work a bit over 13h for this to kick in. (Amounts are too low for IC/NI deductions I believe.)

Are we really saying that unless you tick the less than 10h box, If you are on UC and earning you are going to have to go via the Low Wage route and therefore provide wage evidence?

Thanks