Change background screening provider on a requisition

Summary:

If on a requisition you select a background screening or assessment provider and then post the requisition and have applicants against it with some at the offer stage – can you then go back and change the provider selected, or is it like a CSP once its selected you cant change it ?

Content (required):

If on a requisition you select a background screening or assessment provider and then post the requisition and have applicants against it and some at the offer stage – can you then go back and change the provider selected, or is it like a CSP once its selected you cant change it ?