Hola
Tal vez asi:
Código SQL
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Select DISTINCT M.Anexo, M.Voucher, M.Documento,
SUM(iif (M.AFC = 'V', M.n_imp,0)) As Valor,
SUM(iif (M.AFC = 'I', M.n_imp,0)) As IGV,
SUM(iif (M.AFC = 'N', M.n_imp,0)) As NoAfecto,
SUM(iif (M.AFC = 'P', M.n_imp,0)) As Total
from tblmovimientocontable M
where M.Periodo = '200912' and M.Libro = '22'
group by M.Voucher, M.documento, m.ANEXO
Saludos