There is an master data infoobject 0batchno
it has attributes like size,color
the data is like this
PREVIOUS DATA(3 MONTHS BACK)
batch no size color
101 medium red
102 large green
the requirement is that 3 months back the data was like above
now the data has changed
batch no size color
101 small orange
102 medium pink
if the user requires the data of the 3months back the data that is displayed above must be displayed
but if the user requires the present data,the data which is displayed after the data has changed must be displayed
how to achieve this pls guide me