AD0123 -Inconsistent value for PARAMTYP

Hi,

We have a parameter in ADQS dataset and we are peforming deriviation based on certaim condition if iresult missing from source - and we want to show NULL values in the listings so kept missing AVAL and AVALC results - and few observations derived and populate PARAMTYP for same parameter and I observed below error message in Open CDISC log file - Does it okay if we submit this obsevations in the ADaM submission or do we need do drop observations which has AVAL or AVALC is NULL -Appreciate your inputs.

PARAMTYP, PARAMCD null, PSTSCOW AD0123 Inconsistent value for PARAMTYP

Thanks,

Venkata