Pricing procedure - condition technique

Hi,

I came across the below information when I was going through the condition technique.

"You determine the calculation type for a condition type in Customizing. This determines how the system calculates prices, discounts and surcharges for a condition. When setting up condition records, you can enter a different calculation type than the one in Customizing. At present all available calculation types are permitted. The field u2018Calculation typeu2019 can however not be accessed if this field is left empty. After the data release has been printed, if the field has not been completed manually, the proposal is automatically taken from Customizing. After this it is no longer possible to make manual changes."

Could you explain what the last two sentences (in bold) mean and about what a data release is.

Thanks

Aparna