A model version records the various developmental changes that the model has undergone. Each time you save any changes in a model, a new model version is created with a sequential version number. Therefore, each version is preserved and serves as a record of each set of changes made in a particular save.
Two types of model versions exist:
Delta Version: A delta version is created when you initially save a new model or when you save changes to an existing model.
If you do not want to maintain multiple versions, you can clear the Maintain multiple versions check box. If you clear the checkbox, then CA ERwin Data Modeler does not create a delta version for any incremental save. CA ERwin Data Modeler updates the current version every time you save the model.
Named Version: A named version is created from a delta version, or from another named version. A named version represents a milestone in the development of the model, or at least a version that you want to keep indefinitely. When you save the changes in a named version, the changes are saved in the same version.
The Based upon field in the Edit Catalog pane displays the version number from which the Named version is created.
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