DEFINE 

    MEASURE final_data[Incurred ILR] = DIVIDE(sum(final_data[total_incurred_claims]), sum(final_data[ctd_signed_premium]))
    MEASURE final_data[Ladder ULR] = DIVIDE(sum(final_data[ctd_forecast_ultimate_claims]), sum(final_data[ctd_forecast_ultimate_premium]))
    MEASURE  final_data[test] = IF(final_data[Ladder ULR] < final_data[Incurred ILR],1,0)
    
    var filteredTable = FILTER(final_data,
                                AND(final_data[test] =1,final_data[Ladder ULR] <> BLANK()))


EVALUATE(
SELECTCOLUMNS(filteredTable,
    "as_at_date", final_data[as_at_date_attrition],
    "dev_qtr", final_data[dev_qtr_attrition],
    "reserving group", final_data[reserving_group_attrition],
    "yoa", final_data[yoa_attrition],
    "Total Incurred claims", final_data[total_incurred_claims],
    "Signed Premium", final_data[ctd_signed_premium],
    "ILR", final_data[Incurred ILR],
    "Ladder Ultimate Claims", final_data[ctd_forecast_ultimate_claims],
    "Ladder Ultimate Premium", final_data[ctd_forecast_ultimate_premium],
    "Ladder ULR",final_data[Ladder ULR],
    "Ladder ULR < ILR",final_data[test])

)

SELECTCOLUMNS IS A FUNCTION , it accepts the table name as the first argument, then you pass in the name of the column followed by comma followed by what that column should populate