TCM0066120 | Claims - capture (L-P): NINO incorrectly entered during capture (Info)
From HM Revenue & Customs · Tax Credits Manual
If you realise that you have used the wrong NINO whilst using Function CAPTURE APPLICATION you mustn’t select [Store], otherwise the claim will be stored on the computer and appear on the Incomplete Applications work list.
Instead, you must abandon the function by selecting [Cancel] and start again.
If you realise you have used the wrong NINO after you have selected [Store]
take a note of the correct details
use Function CAPTURE APPLICATION using the NINO that you used before
record your action in the Application Notes field on the Summary Information screen
contact your own support unit area.