Without EP you cannot have Role centers - role centers works on the Enterprise portal framework.
You need to install the EP framework and requires components for Role centers - refer installation guide for more help.
As per my knowledge you will get EP frame work as default - you no need to purchase it again - but for functionalities in EP you need to have license - that means for different roles - example Employee role , customer role , sales person role etc.
i want to configure “Packing slip” as default in Quantity drop down button, when i make Invoice. is there any to set default as “pakcing slip” when i post Invoice. kindly help me.