Another way of doing this using GROUP BY,

with cte1 as (

select DT from dp group by DT having COUNT(distinct type)=1 and count(nr)>1

),

cte2 as (

select DT from ln group by DT having COUNT(distinct type)=1 and count(nr)>1

)

select dp.* from dp join cte1 on dp.dt=cte1.DT

UNION

select ln.* from ln join cte2 on ln.dt=cte2.DT