If appropriate, you can change the site currency by clicking Change. Usually you will select the currency of the country where the site is located.

The locality where the site is located. The locality is used to determine what taxes may apply to supplier resources created for the site.

May be saved, user is not warned: The resource demand can be saved when a GL account cannot be derived or when a cost type is missing.
May be saved, user is warned: The user receives a warning message when trying to save the demand. (Default)
Cannot be saved: A valid cost type and GL account are required in order to save all resource demands.

Individual transactions can still be posted to closed periods using the Post to Closed Period action on the transaction.