To drop a workspace, within the same OMBPlus session, no other OMB commands should be issued before or after the OMBDEINSTALL WORKSPACE command. The workspace name must exist for the specified owning db user.
parseDeinstallOWBRepositoryCommand = OMBDEINSTALL ( OWB_REPOSITORY | WORKSPACE ) "QUOTED_STRING" USING CREDENTIAL "UNQUOTED_STRING"
Specify the workspace name and, optionally, the workspace owner. If not provided, owner defaults to the user supplied in the connection string.