You can modify the properties of an existing attribute within a model.

To modify an attribute

1. In the Models list, select the model that you want to edit and then click the Edit model button.
   

2. In the model editor that appears, in the Entities list on the left, select the entity whose attribute you want to modify. The properties appear in the workspace and the Attributes and Relations lists populate with any associated attributes and relations.
3. In the Attributes list on the right, select the attribute whose properties you want to modify. The properties appear in the workspace.
4. In the workspace, change properties as necessary. The table below details the properties that you can change.

   Attribute properties

   Property Name	Type	Description
   (Id)	ID	A unique identifier for the attribute. Used internally by the system.
   Name	String	The name for the attribute.
   Binding	ID	The database object that the attribute represents.
   DataType	Enum	The data type for the attribute.
   DiscourageGrouping	Boolean	Indicates whether data is grouped by entity instead of by attribute.
   Format	String	The default format for the attribute.
   Hidden	Boolean	Indicates whether the attribute is hidden from end users.
   IsAggregate	Boolean	Indicates whether the attribute is an aggregate.
   Nullable	Boolean	Indicates whether the attribute can have a null value and is used in filter and parameter editors to provide special values.
   ValueSelection	Enum	Determines what control is used to display attribute values in the filter and parameters editors. Dropdown shows lookup values in a dropdown control. List shows more values at once than Dropdown. None disables the entire lookup process. By default, ActiveReports Server selects this value based on the UAVC (unique attribute values count): Less than 200 - Dropdown Between 200 and 1,000 - List Otherwise - None
   Supports Null Values	Boolean	Indicates whether the attribute supports null values.
   Supports Blank Values	Boolean	Indicates whether the attribute supports blank values. This property only applies to attributes with a string DataType.

5. If the attribute that you are modifying has a list of variations under it such as date parts (e.g. Expense Day, Expense Month) or aggregations (e.g. Total Amount, Avg Amount), that you have modified with format changes or deletions, you can click the Regenerate command at the top right of the Attributes list to generate all of the available variations. Note that the attribute for which you want to regenerate variations must have focus for the Regenerate command to appear.