Controlling Uniqueness and Reuse of Data Items

You can control naming restraints and reuse for data items with CDM model options, by selecting Tools > Model Options .

Option	When selected	When cleared
Unique code	Each data item must have a unique code. If you try to select this option and some existing data items are already sharing a code, the following error will be displayed: Unique Code option could not be selected because two data items have the same code: `data_item_code` To be able to select the option, you must first assign unique codes to all data items.	Multiple data items can have the same code, and you differentiate them by the entities that use them. The entities are listed in the Used By column of the list of data items. Note: To make an item visible in a list, click the Customize Columns and Filter tool in the list toolbar, select the appropriate check box from the list of filter options that is displayed, and click OK.
Allow reuse	One data item can be an entity attribute for multiple entities.	Each data item can be an entity attribute for only one entity

Option

When selected

When cleared

Unique code

Each data item must have a unique code.

If you try to select this option and some existing data items are already sharing a code, the following error will be displayed:

Unique Code option could not be selected because two data items have the same code: data_item_code

To be able to select the option, you must first assign unique codes to all data items.

Multiple data items can have the same code, and you differentiate them by the entities that use them. The entities are listed in the Used By column of the list of data items.

Note: To make an item visible in a list, click the Customize Columns and Filter tool in the list toolbar, select the appropriate check box from the list of filter options that is displayed, and click OK.

Allow reuse

One data item can be an entity attribute for multiple entities.

Each data item can be an entity attribute for only one entity

For more information about CDM model options, see Setting CDM/LDM Model Options.