CIS Re-verification

Can any one assist me in answering this question I received from my Payments Team:

We set a subcontractor up in Oracle, originally we were told that he was a sole
trader and he came up as ‘unmatched’ for tax purposes, which deducts 30%.
We have since been told that he is a partnership and he should be ‘net’ for tax
purposes and have 20% tax deducted from his payments.  We have amended him
from sole trader to partnership but the system will not let us re-verify him.
We now have an invoice to pay, which he is chasing payment of, but presently