Loading new master data

Hi experts!!!
I am going to load new master data in our BI.Our BI consists of some cubes and DSOs which have data from past 3 years and which are based on old master data.Now the Master Data is completely changed to new values and will be loaded into our BI.I have following doubt regarding this:
From past three years the transaction data that is loaded into our cubes and DSOs is based on Old Master data.Now if I suddenly load NEW master data values,what will happen to this old transaction data loaded until today?I can imagine that once I load new values,from now onwards,transaction data will be based on new values only.The question is what will happen to the old transaction data ?
Please assume both cases of Time Independent Master data and Time Dependent Master data while reading my question.
Thanks for your time.

Hi,
Case1 (normal case, happens frequently) - Only attributes of master data has changed.
Your transaction data would reflect the old master data when you have master data lookups or reads on master data table (P, Q tables for time indep/time dep MD) for populating master data in the transaction data flow.
In case just the attributes on the master data objects like Customer/Material have changed and these are used at the query level, the queries would show the new attribute values. In case the time validity/dependency has changed, the new time validity takes effect. For e.g Person X is respnsible for cost center A from 01/01/2010 till 31/12/2012. Now MD gets changed and Person Y is responsible for Cost Center A from 01.01.2011 till 31/12/2015. If the report is run now, the person Y would be shown in the report.
Case 2 - The master data has big changes in the source system. for e.g. Cust 10000 is now 11111 or material 12345 is now 112233.
In these cases your historical transaction data would be showing old master data.
For e.g Person X is respnsible for cost center A from 01/01/2010 till 31/12/2012. Now Cost center A is changed to B and person Y is responsible for the same period. Old transactions with Cost center A shows X as responsible and new transactions with Cost center B shows Y as responsible.
Even if your master data has changed completely, there would not be any affect on the existing transaction data....as new master data entries would be written to the tables and the existing master data remains.

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http://help.sap.com/saphelp_nw04s/helpdata/en/e5/f913426908ca7ee10000000a1550b0/content.htm
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