Firebird - Curva ABC

SELECT
   DISTINCT
   PED.CODPESSOA,
   PES.NOME,
   (SUM(PED.TOTALLIQB) OVER()) AS TOTAL,
   (SUM(PED.TOTALLIQB) OVER (partition BY PED.CODPESSOA)) AS TOTAL_PESSOA ,
   ((SUM(PED.TOTALLIQB) OVER (partition BY PED.CODPESSOA)) / (SUM(PED.TOTALLIQB) OVER()) * 100) AS PERC
FROM PEDIDO PED
INNER JOIN PESSOA PES ON PES.CODPESSOA=PED.CODPESSOA
WHERE
   PED.DATA BETWEEN '01/01/2019' AND '12/31/2019'
   AND PED.SOMAFAT = 'S'
   AND PED.TIPOMOV = 'S'
   AND PED.TOTALLIQB > 0
ORDER BY
   TOTAL_PESSOA DESC, PES.NOME, PED.CODPESSOA