How to extend DRF SOAP Outbound Service with Custom Fields?

Hello,

We are presently configuring the Data Replication Framework successful an S/4HANA on-premise strategy - for the replication of information to SAP Cloud for Customer. Our request is to widen the Business Objects (e.g. 986 BP oregon 194 Material) oregon the Outbound SOAP Messages with customized fields. Unfortunately, I cannot find immoderate documentation oregon assemblage contributions that picture the procedure

Can anyone help?

Thanks successful beforehand and champion regards