Error: 'string or binary data would be truncated'

I cannot open or save the plan. The following error message generates:
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​An unexpected error occurred. Please report this problem to your system.administrator with the following information:
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System.InvalidOperationException: String or binary data would be truncated.
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I cannot import data due to the following error:
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​Orchestrate data flow import has failed. The detailed information is as follows:
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String or binary data would be truncated
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Import command:
EXEC [wf].[Populate_Staging_DB] @DataSourceName = 'StandardStagingDatabase' @DatabaseName = 'orc_StagingDatabase'

Please raise a new case online and reference the title of this article.