When splitting or editing an element an error message displays: ORA-02289 sequence does not exist
Run the Spatial checker scripts. From GIS0020 form->Administration ->Health Check tab. This should report on any errors in your spatial data. Usual culprits are spatial asset views where the Update on Edit Flag is set to 'I' (immediate) instead of 'N'.Also it never hurts to rebuild all your sequences running:
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