Attribute change run is process to update the aggregates 
with masterdata attributes and hirarchies.

When master`data changes of the nav. attribute or 
hierarchies must be applied to the depending aggregates . 
this process is called change run or attribute change run.
Newly loaded masterdata is not active until the change run 
applied the changes to all aggregates

When we use navigation attributes, hirerachyes are buliding 
my aggregates and when we load master data it goes on over 
write those effects are inform my aggregates so we need to 
do attribute change run by using RSATTR tcode or RSA1 tool 
menu click on Apply change hirerachy change run.

When there is change in master data or in attributes then 
we run in change run to re arrange the characteristics and 
key figures of a cube or aggregates.
It can be run through...RSDDS_ATTR_CHANGERUN