CDO

I was trying convert WRF output to grib format file.

cdo sinfo wrfout_d01_2010-06-16_00\:00\:00

Horizontal grids :
1 : curvilinear > size : dim = 2401 nx = 49 ny = 49
XLONG : min = 13.425087 max = 14.0452194 degree_east
XLAT : min = 45.4875946 max = 45.9206505 degree_north
available : xvals yvals
2 : generic > size : dim = 34
3 : generic > size : dim = 35
4 : generic > size : dim = 4
5 : curvilinear > size : dim = 2450 nx = 50 ny = 49
XLONG_U : min = 13.4186325 max = 14.0516129 degree_east
XLAT_U : min = 45.4875526 max = 45.9206505 degree_north
available : xvals yvals
6 : curvilinear > size : dim = 2450 nx = 49 ny = 50
XLONG_V : min = 13.4250183 max = 14.0452194 degree_east
XLAT_V : min = 45.48312 max = 45.9251442 degree_north
available : xvals yvals
7 : generic > size : dim = 1
Vertical grids :
1 : surface : 0
2 : generic level : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
3 : generic level : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
4 : generic level : 1 2 3 4
Time axis : 1 step
YYYY-MM-DD hh:mm:ss YYYY-MM-DD hh:mm:ss YYYY-MM-DD hh:mm:ss YYYY-MM-DD hh:mm:ss
2010-06-16 00:00:00
cdo sinfo: Processed 113 variables over 1 timestep. ( 0.00s )

cdo -f grb selgrid,1,5,6,7 wrfout file.grb

I get a grib file containing only 2D variables.(?) When I read grib file using other
program I get 0 vertical levels and latitude range "45.92 45.49 Grid distance: -0.01" (negative grid distance?)
It should be "45.49 45.91 Grid distance: 0.01"

Thank you in advance.
Jure