Change of Source Structure for Partial Settled WBS elements -> CJ02

Hi

As per standard SAP, the change of source structure under settlement perameters of WBS element is not supported when the settlement of WBS element is done either partial / full.

However, the client needs this change by doing any Z-Development as one time activity (since the source structure was changed for certain WBS elements as per change in business process).

Can i Know procedure to do the Z development to modify the source structure for partial settled WBS elements and also let me know the any side effects in this regard.

Regards

Anil