Add all the correspondence types that are to be exposed to the OData service in the following Customizing activity:

 SAP for Utilities Customer Service SAP Multichannel Foundation for Utilities and Public Sector Maintain Settings for Business Processes .

If no entry is made, no correspondence type is exposed.

If, for performance reasons, you want to restrict the correspondence that can be displayed to a maximum date range (for example, so that user can only see correspondence from the last 12 months), you can use the optional parameter MaxDaysRange. Setting this to, for example, 365 days, ensures the user is only able to display correspondence for that period. Should the user attempt to retrieve correspondence from the last 2 years using the OData filter, an error message is displayed.