155dca79_sion_Types___SAP_Documentation__Description
[Type] Category [Identifier] C [ID] Category in Planning and Rate applications C_Category in Consolidation and Ownership applications [Description] 
Contains the types of data you are going to track, such as Actual, Budget, and Forecast. You can set up categories to store versions, such as BudgetV1, BudgetV2.
Dimension Types - SAP Documentation
Description