oracle database filter with full outer join and coalesce intersect
You can simply group by IPDL:

SELECT 
    RAP.IDPL,
    MAX(C41.TIP_COD_DESEU) AS CD41, MAX(C41.STOC_VAL) AS CANT41,
    MAX(C42.TIP_COD_DESEU) AS CD42, MAX(C42.STOC_VAL) AS CANT42,
    MAX(C43.TIP_COD_DESEU) AS CD43, MAX(C43.STOC_VAL) AS CANT43
FROM CHEST_UL CHT
    INNER JOIN UL_PUNCT_LUCRU rap
        ON cht.fk_id_raportor = rap.id
    FULL OUTER JOIN CH_41_TAB1 C41
        ON C41.FK_ID_CHEST = CHT.ID
    FULL OUTER JOIN CH_42_TAB1 C42
        ON C42.FK_ID_CHEST = CHT.ID
    FULL OUTER JOIN CH_43_TAB1 C43
        ON C43.FK_ID_CHEST = CHT.ID
    FULL OUTER JOIN CH_44_TAB1 C44
        ON C44.FK_ID_CHEST = CHT.ID
    FULL OUTER JOIN CH_5_TAB1 C5
        ON C5.FK_ID_CHEST= CHT.ID
WHERE COALESCE (C41.STOC_VAL,C42.STOC_VAL,
                  C43.STOC_VAL,C44.STOC_VAL,
                  C5.CANT_PREL)
        IS NOT NULL
GROUP BY RAP.IDPL


Are you sure you need the FULL joins? Try changing all to LEFT, might return the same result.

If this can be simplified further depends on the actual PK/FK and data...