3474317 - Unable to update the Field EBELP of the Importing Structure IS_ENHANCED_FIELDS

When Creating Purchase Order in app Manage Purchase Orders (App ID F0842A)  no data flowing in the EBELN and  EBELP field using the implementation of BADI FOT_EXT_CALC_FIELDS_CHANGE. 

SAP S/4HANA Cloud 

When the Purchase Order is being created there is no PO number yet.

BADI FOT_EXT_CALC_FIELDS_CHANGE can be utilized when create invoice for purchase order for example using app Create Supplier Invoice (App ID F0859) or Create Supplier Invoice - Advanced  (MIRO)

FOT_EXT_CALC_FIELDS_CHANGE

F3438, Custom Logic Tracing,  EBELN and  EBELP  , KBA , XX-PART-TIF , Tax Interface (USA) , How To