How to enhance idoc message type BUPA_INBOUND_MAIN_SAVE_M

Dear colleagues,
We would similar to widen the connection benignant BUPA_INBOUND_MAIN_SAVE_M with customized segments, and heighten the outbound processing to capable the customized fields.
We person erstwhile experiences with connection types DEBMAS and CREMAS, and the corresponding BADIs (CUSTOMER_ADD_DATA_BI, VENDOR_ADD_DATA_BI...), what's the equivalent BADI oregon SAP enhancement for BUPA idoc?
Thanks successful advance,
Luis.