10000380 
Message
Cannot open file; attachment has been changed or deleted
Diagnosis
You have opened the My Activities window, and have chosen the 
(attachment) icon in a table row, but the attachment file has been changed or
deleted and cannot be retrieved by SAP Business One.
Procedure
Follow the steps below:
In the My Activities window, select a task and choose the Activity button. The Activities window appears.
Select the Attachments tab.
Choose the Browse button to open a window from which you can select a file to attach.