Available Capacity Versions in the Work Center 
Use
You use this function to plan orders over several shifts.
Prerequisites
You can find these in the Customizing for Production by choosing Basic Data ® Work Center ® Capacity Planning ® Available Capacity ® Define version of available capacity.
Features
You can plan over a period of several shifts.
A work center can have several available capacity versions with regard to its capacity (for example, normal, normal with overtime, weekends and so on). This is useful, for example, if there are two shifts each day in your company and you have to schedule an order which takes longer than a single shift to process.