Solution : https://service.sap.com/sap/support/notes/376248 (SAP Service marketplace login required)
Key words :
directory~ftp/general/r3server/abap/note, additional key words abt1, create fixed assets, intercompany asset transfer, program design error, existing user fields, user fields, transaction abzon, solution due, support package
Related Notes :
378101 | Create with reference:user-defined fields not transferred |
13719 | Preliminary transports to customers (note for customers) |