The system enables this field when you check the Approval Required on RQ for Purchase box.
Enter a default reviewer for quote lines, or leave blank to assign reviewers to quote lines manually. Press F4 to see a list of active reviewers (from HQ Reviewers). Press F5 to access HQ Reviewers.
The system assigns the specified reviewer to each requisition line initialized to a quote or routed directly to purchase (bypassing the quote process). Reviewer must approve the quote or requisition line before you initialize it to a purchase order.