This issue is not solved and shouldn't be marked as such.

Please see the following post.

https://quickbooks.intuit.com/learn-support/en-uk/transactions/categorisation-of-cis-expenses-why-sh...

It also contains a link to the post on QB Idea Exchange.

The more votes on the Idea exchange the better. Bizarrely, 'cheers' on a community post don't convince QB, it has to be on the Idea Exchange where 50 votes count :\