Lock field in Sourcing after integration

Hello Experts,

We are uploading MA into CLM with the xls upload document, so we create the excel document with information and upload it into CLM

but what we want after upload the document and have the information in CLM is lock some fields, becasue we dont want that anyone change them anymore.

is there a script to block fields? or a way to do this?

thanks in advance

Kind Regards