Struct as an array of pointers to struct

[galileopy]

Here it goes.
I have a little problem when trying to use the struct proyecto_t,
The code 1 below is a copy of my structures file.
Then there's a copy of one of the procedures that is working fine with a proyecto_t variable. That's code 2.
But when I try to access a element pointed by PRO->actividades[i]->dur, that is a unsigned int with scanf(), my program crashes... I did try to use the address of (&) operator and also tried using it twice but nothing happens it is still crashing at runtime.
Code 3 is the copy of the procedures that fails.

1. I tried to use array notation.
2. Also using the pointer arithmetic, but it is still crashing

Thanks a lot, meanwhile I'll be trying to help someone else xD

1.---------CODE---------------

#ifndef _ST_ACTIVIDAD_
#define _ST_ACTIVIDAD_
struct actividad 
{
	char name[15];
	unsigned int dur; 
};
typedef struct actividad actividad_t;
#endif

#ifndef _ST_PROYECTO_
#define _ST_PROYECTO_
struct proyecto
{
	unsigned int n; 
	actividad_t *actividades; // here it is, this is the one that's not working
};
typedef struct proyecto proyecto_t;
#endif

#ifndef _ST_RELACION_
#define _ST_RELACION_
struct relacion
{
	short **relaciones; // THIS WORKS FINE AS A MATRIX
};
typedef struct relacion relacion_t;
#endif

2.------CODE------------

#ifndef P_INI_ST
#define P_INI_ST
void ini(proyecto_t *PRO, relacion_t *REL)
{
	

	unsigned int
	i;
	PRO->actividades = (actividad_t*) malloc(sizeof(actividad_t)*(PRO->n));// No warnings from the compiler here.
	REL->relaciones= (short**) malloc(sizeof(short*)*PRO->n);
	
	for(i=0;i<PRO->n;i++)
	{
		REL->relaciones[i]= (short*) malloc(sizeof(short)*PRO->n);
	}
	
}
#endif

3.-------CODE-------

#ifndef P_LEER_PROYECTO_ST
#define	P_LEER_PROYECTO_ST
void leer_proyecto(proyecto_t *PRO, relacion_t *REL)
{
	unsigned int
	i;
	for(i=0;i<PRO->n;i++)
	{
		printf("Ingrese actividad: ");
		scanf("%[^\n]s",&(PRO->actividades[i]->name));
		printf("Ingrese duracion: ");
		scanf("%u",&(PRO->actividades[i]->dur)); // When here it crashes
	}
	
}
#endif