Try not saving the functional location. Run IL02, add the URL, message SGOS_MSG043 is issued. Do not press save, Just run IL03 and see if the attachment is available - Select 'services for object' then 'attachment list'.
Test the other types of attachments - Attach a small txt file or create a note. Do these work?
It would also help to identify if the attachment feature works for orders, notifications and equipments.
Do the authorization test as mentioned by Pete.
Based on your SAP_BASIS patch level check for notes under component BC-SRV-GBT-GOS.
-Paul