Cause

In the parts database to be checked a part was found where a document was entered which EPLAN cannot find.

Solution

1. In the message management dialog mark the line with the message and select the Properties popup menu item.
   
   The Parts management dialog is opened, the respective part is already marked in it.
2. Bring the Properties tab to the front.
3. In the property table open the hierarchy levels Documents > External document: File / hyperlink to make the indexed properties visible.
4. Click [...] in the value field of the indexed property in which the document output by the message management is entered.
5. Select an existing document from the selection dialog opened.
   
   Or alternatively to this, delete the entered document macro in the value field of the property.
   
   Or store a new document in the desired document directory and select it again at the indexed property.
6. Close the parts management, save the modified data, and carry out a parts synchronization.
7. If required, start a new check run.