CDO

Dear all,
With my ECMWF grib data when I use the ECMWF tools like grib_ls, I obtain the next information:

grib_ls -P parameter,dataType ecmwf_example.grb | more

parameter edition centre param levelType lev date stepRange dataType short_name valuesCount gridType packingType
228246 1 ecmf 246.228 sfc 0 20120314 3 fc 228246 66129 regular_ll grid_simple

When I use cdo with tools related with selection of records or dates I have no problem, but when I try to do it with other operations related with statistical values,interpolations or modifications, several keys are lost or not found

For example:

cdo setmon,03 ecmwf_example.grb 03_ecmwf_example.grb
grib_ls -P parameter,dataType 03_ecmwf_example.grb | more

parameter dataType edition centre param levelType lev date stepRange short_name valuesCount gridType packingType
not found not found 1 ecmf 246.228 sfc 0 20120314 3 not found 66129 regular_ll grid_simple

In this case parameter, dataType and short_name are lost

I send an example
Where is controlled in the code the number of keys written in grib files?
It could be fixed in future versions?

I have tried compiling with grib_api and the remains the same

Thank you very much in advance