row to col and previous row

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CREATE table #codigos
  ([codigo] varchar(10), [origen] varchar(10), stock int)
;

CREATE table #dpm_trace
  ([codigo] varchar(10), anyomes int, ent int, sal int)
;

    
INSERT INTO #codigos
    (codigo, origen, stock)
VALUES
    ('01716', 'interno', 1000),
    ('001', 'externo', 10),
    ('002', 'interno', 20),
    ('003', 'compras', 0)
;


INSERT INTO #dpm_trace
    (codigo, anyomes, ent, sal)
VALUES
    ('01716', 202401, 10, 20),
    ('01716', 202402, 30, 0),
    ('01716', 202403, 0, 50),
    ('01716', 202404, 100, 200),
    ('001', 202401, 0, 0),
    ('001', 202402, 30, 0),
    ('001', 202403, 20, 20),
    ('001', 202404, 0, 10)
;

  WITH stock_proyectado AS (  -- stock inicial del primer mes y acumulado entrada y salidas
      select 
        ROW_NUMBER() OVER ( PARTITION BY d.codigo ORDER BY d.codigo, d.anyomes) as rn,
        d.codigo, c.origen, d.anyomes, c.stock as stock_actual, d.ent, d.sal,
        sum(d.ent) over (partition by d.codigo order by d.codigo, d.anyomes) as ent_acumulada,
        sum(d.sal) over (partition by d.codigo order by d.codigo, d.anyomes) as sal_acumulada
      from #dpm_trace d
      left join #codigos c ON c.codigo = d.codigo
  )
  select 
    rn, codigo, origen,
    stock_actual,
    anyomes,
    case when rn=1 
      then stock_actual
      else stock_actual 
          + LAG(ent_acumulada, 1) OVER (ORDER BY codigo, rn) 
          - LAG(sal_acumulada, 1) OVER (ORDER BY codigo, rn) 
    end as stock_ini,
    ent,
    sal,
    --ent_acumulada,
    --sal_acumulada,
    --[stock_fin] = 1
    [stock_fin] = stock_actual + ent_acumulada - sal_acumulada
  from stock_proyectado

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