Query on MAM/MAU enhancement

Hi,
I am working on xMAU 3.0 SR1. As a part of enhancements to the standard application, I want to modify some fields in a order on the client side and when I sync these fields should be updated in the backend by a BADI.
As per my understanding I should be using only the process classes to persist values to local DB2E on the client side. I checked the methods for persisting the order fields in the client side and realised that as per the existing process class for order (com.sap.mbs.mam.order.process.OrderProcess), I can just save order header(Mam001), order operation(Mam001Item080) and partner(Mam001Item100).
I want to understand how can I add custom fields in MAU application which can be persisted to the local database as well as which can be synced to the backend.
Example: I add a System Condition (I have create a BADI in the backend to add this field). This field when synced comes as a part of Mam001Item020 (Please have a look at com.sap.mbs.mam.order.control.OrderDetailCustEnh) to the client. Now this field cannot be modified and persisted in local database since there is no process class available.
I have already gone through the enhancement guide twice and did not find any solution. Please let me know if you have any solution.
Best regards,
Nakul

Hi Oliver,
Thanks for your response.
I agree with you that BADI needs to be devloped for create,modify and create functionality. But this change is related to backend.
With regards to the front end changes for saving fields in MI client DB, I will need to call process classes to save the fields. As I mentioned earlier, the current process class(com.sap.mbs.mam.order.process.OrderProcess) does not have provision to save Mam001Item020. And I am not sure if I should be persisting a MAM custom enhancement field value in the client database without calling the process class.
The question still remains - How I can save the fields in MI client?
Thanks and warm regards,
Nakul

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