convert ARXML to DBC: SG_ AND BO_ EMPTY

[ying2029]

Python 3.12.4

first ：convert dbc to arxml

the log shows below: '4 frames found'

PS C:\Users\xx> canconvert -vv C:\Users\30608\Downloads\dbc\test_frame_decoding.dbc
C:\Users\xx\Downloads\dbc\test_dbc.arxml
INFO - convert - Importing C:\Users\30608\Downloads\dbc\test_frame_decoding.dbc ...
INFO - convert - Import Done
INFO - convert - Exporting C:\Users\30608\Downloads\dbc\test_dbc.arxml ...
DEBUG - convert -
INFO - convert - 4 Frames found
INFO - convert - Export Done

second: convert the arxml to dbc

the log shows below: '0 Frames found' why ? the commandline I input is worng?

PS C:\Users\XX> canconvert -vv C:\Users\30608\Downloads\dbc\test_dbc.arxml C:\Users\30608\Downloads\dbc\test_dbc.dbc
INFO - convert - Importing C:\Users\30608\Downloads\dbc\test_dbc.arxml ...
DEBUG - arxml - Read arxml ...
DEBUG - arxml - 0 frames in arxml...
DEBUG - arxml - 4 can-frame-triggering in arxml...
DEBUG - arxml - 4 SIGNAL-TO-PDU-MAPPINGS in arxml...
DEBUG - arxml - 35 I-SIGNAL-TO-I-PDU-MAPPING in arxml...
DEBUG - arxml - CONTAINER-I-PDU-HEADER-BYTE-ORDER not found (default big endian)
DEBUG - arxml - Busname: CAN
DEBUG - arxml - Baudrate: 0
INFO - convert - Import Done
INFO - convert - Exporting C:\Users\30608\Downloads\dbc\test_dbc.dbc ...
DEBUG - convert - CAN
INFO - convert - 0 Frames found
INFO - convert - Export Done