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Error saving packages to the Meta Data Services repository
By Darren Green

The following error may be received when using the SQL Server 2000 DTS tools to save a package to the Meta Data Services repository on a SQL Server 7.0 server.

Error Source: Microsoft Data Transformation Services (DTS) Package

Error Description: Information models in the specified Meta Data Services 
repository database must be updated in order to save this DTS package version
The specified object cannot be found.

As indicated in the message there have been changes in the repository structure between the two releases, specifically the DTS Information Model, which is the area of the repository used to persist DTS packages saved to this location.

You can upgrade the DTS Information Model using the model installer command-line utility (Insrepim.exe). For details of this please refer to the SQL Server 2000 Books Online topic DTS Information Model