3069900 - Error on saving communication arrangement SAP_COM_0086

The following error is displayed when saving the communication arrangement SAP_COM_0086 (for UI Theme Designer integration):

Runtime Error: 'RAISE_SHORTDUMP'. The OData request processing has been abnormally terminated. If you use SAP S/4HANA Cloud, please create a case. Otherwise, if "Runtime Error" is not initial, launch ADT feed "Runtime Errors" or transaction ST22 / SM21 (system log analysis) for details and analysis.

• SAP S/4HANA Cloud
• SAP Marketing Cloud

The wrong URL is being used for the host on the communication system.

Ensure the host on the communication system is pointing to the theme proxy application and not to the actual custom theme.

For the full details of the configuration, refer to the Help Page.

communication system arrangement s/4hana cloud marketing cloud s4c custom theme integration ui theme designer , KBA , CA-UI2-THD , Theme Designer , Problem