Hi Susan,
Orders can be deleted form the Current grid (and a Security option can be set to disallow deleting orders), but Invoices and Credit Notes should not have a Delete button available. History has a Delete button available for all document types, and this button can be disabled for all screens by disallowing security access to the Purge History function (Maintenance menu).
I suspect the screen you are looking at is the History Invoices, and the solution is to disallow Purge History for that user.
This is just purging OE History and has zero affect on AR, IC, GL or SalesAnalysis or anywhere else in Adagio (apart from reports that read the OE History, of course).
Edited by Softrak Support (03/15/13 12:08 PM)
Edit Reason: more information
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Regards,
Softrak Tech Support