What is important is to add the to merge the source product with the output of the vicarious step.
...
<node id="subset"> <!-- remove the calibrated bands-->
<operator>Subset</operator>
<sources>
<source>${sourceProduct}</source>
</sources>
<parameters>
<sourceBands>altitude,latitude,longitude,detector_index,FWHM_band_1,FWHM_band_2,FWHM_band_3,FWHM_band_4,FWHM_band_5,FWHM_band_6,FWHM_band_7,FWHM_band_8,FWHM_band_9,FWHM_band_10,FWHM_band_11,FWHM_band_12,FWHM_band_13,FWHM_band_14,FWHM_band_15,FWHM_band_16,FWHM_band_17,FWHM_band_18,FWHM_band_19,FWHM_band_20,FWHM_band_21,frame_offset,lambda0_band_1,lambda0_band_2,lambda0_band_3,lambda0_band_4,lambda0_band_5,lambda0_band_6,lambda0_band_7,lambda0_band_8,lambda0_band_9,lambda0_band_10,lambda0_band_11,lambda0_band_12,lambda0_band_13,lambda0_band_14,lambda0_band_15,lambda0_band_16,lambda0_band_17,lambda0_band_18,lambda0_band_19,lambda0_band_20,lambda0_band_21,solar_flux_band_1,solar_flux_band_2,solar_flux_band_3,solar_flux_band_4,solar_flux_band_5,solar_flux_band_6,solar_flux_band_7,solar_flux_band_8,solar_flux_band_9,solar_flux_band_10,solar_flux_band_11,solar_flux_band_12,solar_flux_band_13,solar_flux_band_14,solar_flux_band_15,solar_flux_band_16,solar_flux_band_17,solar_flux_band_18,solar_flux_band_19,solar_flux_band_20,solar_flux_band_21,quality_flags</sourceBands>
</parameters>
</node>
<node id="merged"> <!-- remove the calibrated bands-->
<operator>Merge</operator>
<sources>
<masterProduct>subset</masterProduct>
<vicar>vicarious</vicar>
</sources>
<parameters>
<includes>
<include>
<productId>vicar</productId>
<namePattern>Oa.*radiance</namePattern>
</include>
</includes>
</parameters>
</node>
...
I’ve updated you graph. It should work, but I have not tested it.
subset_SVC_idepix_c2rcc_update.xml (16.2 KB)