I have a requirement where I need to update a custom field in PO Custom Tab when vendor confirmation is received through inbound idoc. The custom field is not present in the idoc structure, this has to be updated with some value based on delivery date from vendor confirmation data. We have ORDERSP message type and FM IDOC_INPUT_SUS_ORDRSP is getting triggered. I am struggling to update the field at PO Item level as I cannot find any exit or BADI where I can add my logic to update the custom field. I have tried BADI ME_MMPUR_EINM_CUST also but the item level data is not getting updated.
Any help will be appreciated.