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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 trace AS(
  select
    codigo,
    anyomes,
    CASE WHEN rn=1 THEN stock_actual ELSE 0 END stock_ini
  from
  (  -- dpm con row number para meses de un mismo codigo
    select 
      ROW_NUMBER() OVER ( PARTITION BY d.codigo ORDER BY d.codigo, d.anyomes) as rn,
      d.codigo,
      d.anyomes,
      c.stock as stock_actual,
      d.ent,
      d.sal
    from #dpm_trace d
    left join #codigos c ON c.codigo = d.codigo
  ) tmp
)
select *
from trace

view current version

edited dec 21 23

created dec 21 23 jon.doe43432