Your default entity will automatically have Invoicing enabled and this can not be disabled. If you have additional entities, Invoicing needs to be enabled in each of these if you wish to use this function.
To do this:
Go to Config > Company Management > select the entity > Invoicing.
Tick Enable Entity Invoicing.
- Click Save.
Once an entity has invoicing enabled, you can configure the settings within this tab. Additional invoice settings and templates are managed in Config > Invoicing.