Barcode change for student

How do I change a student’s  student’s barcode? I tried doing it in B4 P1 but it wouldn’t let me. Is that only for book barcodes?
In Borrower Details – B2/A1 – <F>ind the borrower by name.
Select <C>hange from the option bar; check that the barcode offered is
correct & press <Enter>.

Barcode change

In B4/P1 you can change the barcode.

You need to look up the barcode number in enquiry first so you can manually type it in at B4/P1 then you will be given the next available barcode number which you can stick on the book (or scan the barcode number of your choice).