Using STUFF Function - subquery

Question

I've this table TableA that have these fields: [intIdEntidad],[intIdEjercicio],[idTipoGrupoCons]. The tableA look like for idTipoGrupoCons = 16 this image
enter image description here
I'm trying to use STUFF function to show the column intIdEjercicio separated by coma, something like this;
enter image description here
This is query I'm using to obtain result the above image:
SELECT DISTINCT o.idTipoGrupoCons, o.intIdEntidad, ejercicios= STUFF((
SELECT ', ' + CONVERT(VARCHAR,a.intIdEjercicio)
FROM dbo.[tbEntidades_Privadas_InfoAdicionalGrupo] AS a
WHERE a.idTipoGrupoCons = 16
FOR XML PATH, TYPE).value(N'.[1]', N'varchar(max)'), 1, 2, '')
FROM [tbEntidades_Privadas_InfoAdicionalGrupo] AS o
JOIN tbEntidades_Privadas p On O.intIdEntidad = p.intIdEntidad
WHERE o.idTipoGrupoCons = 16
The result isn't correct, because I execute this query for idTipoGrupoCons = 16
SELECT [idTipoGrupoCons], [intIdEntidad],[intIdEjercicio]
FROM [tbEntidades_Privadas_InfoAdicionalGrupo] A
WHERE A.idTipoGrupoCons = 16
The result is this
enter image description here
It's means that for intIdEntidad = 50 intIdEjercicio is just 7 and for intIdEntidad = 45 intIdEjercicio = 2 and 4
I suppose that the problem is that I need to add a subquery to or a function into STUFF or in the outer WHERE to add condition to intIdEntidad each time to call STUFF function.
I've read about the use of CROSS APPLY and perhaps it can be used to solve the problem

Answer 1

Here is the answer.
The problem was that need to join tableA with the same table into the STUFF function. At the end the query look like this:
SELECT t1.idTipoGrupoCons, t1.intIdEntidad,
,ejercicios = STUFF(
(SELECT ', ' + t3.Ejercicio
FROM [tbEntidades_Privadas_InfoAdicionalGrupo] t2
JOIN tbMtoNoRegistro_Ejercicios t3 ON t2.intIdEjercicio = e.intEjercicio
WHERE t2.idTipoGrupoCons = t1.idTipoGrupoCons
AND t2.intIdEntidad = t1.intIdEntidad
ORDER BY t3.Ejercicio
FOR XML PATH ('')
)
,1,2,'')
FROM [tbEntidades_Privadas_InfoAdicionalGrupo] t1
JOIN tbEntidades_Privadas p ON t1.intIdEntidad = p.intIdEntidad
WHERE t1.idTipoGrupoCons = 17
GROUP BY t1.idTipoGrupoCons,t1.intIdEntidad, p.strDenominacionSocial