ServiceDesk

When raising a ticket via the advanced form and assign directly to a team if the ticket has attachment's all users get the error message "You don't have permission to modify this document category's permissions.", If you move the ticket between teams and assign back to the original team they are then able to view attachments.

Only seems to happen to ticket raised via Advanced forms, if done via the user's (Simple) form this error message does not appear and team members can see any attachments.

I have attached the full error the appears in the logs.

There was a WF you used to have to run via a Ruleset to Grant Document Permissions

Grant Document Permissions to Additional Groups in an Incident/Change ticket
https://www.symantec.com/connect/articles/grant-document-permissions-additional-groups-incidentchange-ticket

Which version of 7.6 are you on?

Forum

Permissions to Document Category After Reassignment
https://www.symantec.com/connect/forums/permissions-document-category-after-reassignment

One option is to ‘Grant Ticket Access’ with a Ruleset, 
 
Login to Process Manager
Admin | Process Automation
Incident Management – Service Dashboard
OnTicketAssigned
 
As an example we have the following
Group
[Incident Is In Queue][Specific Queue([QUEUENAME])]
 
Actions
[Grant Ticket Access][To Specific Group([GROUPNAME])] Using [3 Parameters]

Choose your Permission parameters.