SAP Crystal Reports 2011, Win User's Guide Page 457

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Note:
While the dynamic capability is not available with SAP BusinessObjects BI Interactive Analysis or with
full-client products, Crystal reports that are based on universes can use the dynamic prompting
capabilities described throughout this section.
21.3 Understanding lists of values
List-of-values objects describe how to return a set of values from a data source:
They provide the values for prompts in the prompting dialog box.
They can be either static (the values are stored in the report), or dynamic (the values are stored
outside the report in a database).
They are used for both single-level dynamic prompts, and multi-level cascading prompts.
For example, a list of countries could be a dynamic prompt, while a hierarchical list of countries,
regions, and cities could be a dynamic prompt with a cascading list of values.
Crystal Reports supports three data sources for list-of-values objects:
Report fields (only for unmanaged reports).
Command objects (only for unmanaged reports).
Business Views (only for managed reports).
A list of values can have one or more levels. If there are multiple levels in the list of values, then each
level constrains the next.
You can think of a list of values as the definition of the data needed to populate all levels of a cascading
list. In Crystal Reports, a cascading relationship is defined by a single list-of-values object, not by
multiple queries that are linked together by a common key. Although the list of values is defined as a
single entity, data is not necessarily fetched from the data source in a single query.
Note:
List-of-values objects are not affected by report record selection or group selection formulas. These
formulas affect the report data, not data used for prompt-time lists of values.
If a data connection is broken or reset, Crystal Reports does not attempt to create or update the
dynamic list-of-values object and instead reverts to a static list.
21.3.1 List-of-values types
There are two different types of list-of-values objects:
2012-03-14457
Parameter Fields and Prompts
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