PIVOT for "groups" - rows to columns

Question

How-to convert rows (for group) into columns.

Here is the source table that have:

update: added Id and IdGestion columns

Id  IdGestion   PeticionId  Field       Value
48  17          16          Type        1
49  17          16          SubType     1
50  17          16          Units       1
51  18          16          Type        1
52  18          16          SubType     2
53  18          16          Units       2
54  19          16          Type        3
55  19          16          SubType     6
56  19          16          Units       1

How-to get the Pivot table (target):

RequestId   Type    SubType Units
16          1       1       1
16          1       2       2
16          3       6       1

I try using PIVOT, and ROWNumber(), but get data wrong.

select g.PeticionId,  Tipo,SubTipo,Unidades from [GestionSaliente] g
inner join (
SELECT PeticionId,  Tipo,SubTipo,Unidades
FROM
    (select  gs.PeticionId, Campo, Valor 
      , ROW_NUMBER() OVER (PARTITION BY gs.IdGestion ORDER BY gsd.Id) as rn
       FROM [GestionSaliente]  gs
        inner join [GestionSalienteDato] gsd
        on gs.Id = gsd.GestionSalienteId --where  PeticionId = 16 
        
    ) AS source
    PIVOT
    (
     MIN(Valor)
     FOR Campo IN (Tipo,SubTipo,Unidades)
    ) as pvt

) a
on a.PeticionId = g.PeticionId 

UPDATED: It works now, I think

select g.PeticionId,  Tipo,SubTipo,Unidades from [GestionSaliente] g
inner join (


SELECT PeticionId,  Tipo,SubTipo,Unidades
FROM
    (select  gs.Id IdGroup, gs.PeticionId, Campo, Valor 
     FROM [GestionSaliente]  gs
     inner join [GestionSalienteDato] gsd on gs.Id = gsd.GestionSalienteId
    ) AS source
    PIVOT
    (
     MIN(Valor)
     FOR Campo IN (Tipo,SubTipo,Unidades, Id, Peticion)
    ) as pvt
where PeticionId = 16

FOR Campo IN (Tipo,SubTipo,Unidades, Id or IdGroup, Peticion)