https://userapps.support.sap.com/sap/support/knowledge/en/3589157
3589157 - How to inform and update "LastUsageDate" via SEPA Mandate API_APAR_SEPA_MANDATE_SRV | SAP...
The issue is related to the API_APAR_SEPA_MANDATE_SRV where the fields for 'LastUsageDate' are filled in the API, but there is no effect in the created mandate.