Error: Couldn't save, currently locked...(due to other editing the same object).
Error:
Could not save; currently locked by <username> on machine <machine name>
Cause:
Another user is editing the same object at the same time.
Solution:
Wait until that user is done and then save the changes.
1) Wait until the other user is done.
2) Select the 'Records' menu and select 'Save Record'.