Logic For Loading the Data

Hi Freids

I have a ODS with the folowing fields.

Key Fields : Fiscal year variant,Material,Sold-to party

Market Sub-Subsegment,Fiscal year / period

Data Fields :Market Percentage

My Question is the bisness is asking me to do the following

Could we have the logic in BW to load data in the following way:

Starting a full load for 007.2005 will give back the latest Segmentation until 007.2005.

So we are getting a record from 001.2005 and handle it like a 007.2005.

How am i going to perform this .Can any one help me to understand this an how i should write a start routine or Update rules.

regards

sunder