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"This Developer Name already exists or has been previously used" error when creating a Custom Tab

Knowledge Article Number 000221104
Description When trying to add a Custom Tab in a Developer Edition org, this error is encountered:

This Developer Name already exists or has been previously used. Please choose a different name.
Resolution If a managed Custom Tab for the same object has been deleted from a package under development, then you are unable to add a Custom Tab with the same name back to the org.

For additional information, see Deleting Components from Managed Packages




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