You can delete an existing custom export width definition using the RemoveExportDefinition stored procedure, for example:
Ex. call syslib.RemoveExportDefinition('exportname',msg);
The system deletes the specified definition from the DBC.ExportWidth table. In process transactions using the removed definition continue, but it is unavailable to new transactions.
The user executing the stored procedure must have EXECUTE privileges on the stored procedure or on the SYSLIB database.