Hi Mark,
Try below
User Exits:-
IWO10009 Customer Check for 'Save' Event
BAdI:-
ALM_ME_001_ORDER Order/Operation Data
ALM_ME_ORDER_OPER MAM 1.0 Order Operations
IBAPI_ALM_OPR_GETDET BADI for Reading Fields for BAPI_ALM_OPERATION_GET_DETAIL
Regards
Terence