Insurance certificates are important in subcontracting because only insured and certified subcontractors should be used.
You can create and edit insurance certificates on the P.20.01 Suppliers/Subcontractors: Window 2 screen. You can view (but not edit) insurance certificates on SM.20.11 Subcontractor Details.
Attachments for insurance certificates are handled like the files uploaded for the E-Supplier questionnaire.
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