How to enhance standard web service in C4C?

[63abapdeveloper]

Hi,

in SAP Sales Cloud we have standard web services like BusinessPartnerReplicationIn.

Is there any possibility to enhance this or to define own logic.

In my case, I have to ignore the field "Textcollection" from the ERP, because it deletes our notes in C4C.

Another case: our C4C only allows to create BP Identification Numbers. If we got a update, we have many failures in the inbound.

Now how can I change or enhance the web services BusinessPartnerReplicationIn or ObjectIdentifierMappingReplicationIn ?

Thanks for answers