A lookup is a predefined list of values that are available for selection in a user interface. For business entity models, a regular lookup is linked to a lookup base object that contains a list of reference data. For example, a gender lookup is associated with the C_LU_GENDER base object.
Use dependent lookups when a dependency exists between two lookup tables, such as between a type table and a subtype table. The list of values that display in the subtype table depends on the selection in the type table. Another example of a dependent lookup is when a user populates a list of values for state or province based on the selected country.