Arithmetic overflow error converting float to data type numeric

Hello guys,

I have a query that is resulting me an error:

Arithmetic overflow error converting float to data type numeric

SELECT 
convert(numeric(14,2),round(convert(numeric(17,8),qtdpro)*round(convert(numeric(17,8),prunit)*convert(numeric(17,8),(1-(a.pdes/100)) ), dbo.fn_DigitosValor())  +convert(numeric(17,2),(a.FRETE+a.SEGURO+a.OUTDESP),2),2)) as BASCSLL
from aripco a,arpco b 
where (a.numped = b.numped and a.seqped = b.seqped) 
  and qtdpro > 0 
  and prunit > 0 
  and b.flagoriginal = 0 
  and (B.FLAGFINALIZADO = 0)

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How could I get the row that is resulting me this error?

Thanks
Alex