Simulink is generating ARXML code that is adhering to the AUTOSAR standard for RecordLayout of curves. This standard can be found in the AUTOSAR documentation TPS_SWCT_01296 under "Different approaches of ASAM MCD-2MC and AUTOSAR with respect to swrecrdlayout".
You can see that in an example look up table created with this workflow:
As far as workarounds, it looks like you may have to manually edit the ARXML code that is generated with Simulink. This includes manually adding the "ADMIN-DATA" that the Vector tool requires. It is not feasible to force Simulink to only generate implementation data types.
I would ask Vector for a workaround to import AUTOSAR standard ARXML code in this case.
