This module is used to see which definitions are currently in use and where. To see the definition maintenance, go to Settings - Tools - Definition maintenance.
Application log window in Tools, tab Settings of Astrow Web
Here you can sort the definitions by type:
Sorting definitions by type in Definition Maintenance, tab Settings of Astrow Web
Or by status:
Sorting definitions by status in Definition Maintenance, tab Settings of Astrow Web
To sort, just select the operation type and the status:
Sorting counters in Definition Maintenance, tab Settings of Astrow Web
This will show how many times the definition is used. Click on the mark to see where the definition is used (see Definition Maintenance Details).
Use the button to delete the definitions not used anywhere. Used definitions cannot be deleted.
to see where the definition is used (see 
to delete the definitions not used anywhere. Used definitions cannot be deleted.