Is it possible to process ERA5 data using only pl and sfc files?

[afernandezody]

Hello,
I'm trying to process ERA5 data using exclusively pl and sfc filesso I tried with with era5_to_int. However, and when using the -i option, the system still generates the error:

Error: Could not find file e5.oper.an.ml.128_134_sp.regn320sc.2025090600_2025090605.nc needed for ERA5 variable SP

My question boils down on whether it is possible to process ERA5 files without any ml files. If so, would you recommend using era5_to_int with any modification or any other software?
Thanks.