You are not authorized to process attachments of service entry sheet &1.

What causes this issue?

You have tried to view or edit an attachment or a link of a service
entry sheet for lean services or of one its items, but you do not have
sufficient authorizations to perform these actions. Editing includes
uploading, renaming and deleting an attachment or a link.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Contact your administrator to check the setup of your authorizations of
the following authorization objects:
Purchasing Group
Purchasing Organization
Plant
If you cannot view or edit the attachments and links even though you
have the required authorizations, contact your key user for Information
Lifecycle Management (ILM) to check whether the residence time of the
service entry sheet has passed. In this case, the document has
(possibly) been blocked. Only key users with additional authorizations
can access this data.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.