I’m trying to convert OpenIFS Cy40r1 using operational model data

interpolated onto the normal reduced Gaussian grid and having 137 levels.

I’ve been using the following command:

grib_set -v -s editionNumber=1 ICMGGgruz+201701 ICMGGgruz+201701.grb

ICMGGgruz+201701

GRIB_API ERROR   :  Key "numberOfVerticalCoordinateValues": Trying to

encode value of 276 but the maximum allowable value is 255 (number of

bits=8)

GRIB_API ERROR   :  unable to set NV=276 as long (Encoding invalid)

GRIB_API ERROR   :  grib_set_values[0] editionNumber (1) failed:

Encoding invalid

Is there a work-around for this?