How to avoid backdated postings??

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Dear all,

I am about to upload legacy data and create CN and RU into my system. I want the contracts to be uploaded with their real validity dates, which obviously are in the past, and at the same time, to start performing periodic posting from June 2009. The costs for these contracts have already been manually posted in FI up until May 2009.

I thought i could use the "first posting date" to handle this and it worked fine for the first posting i performed. For example, if my contract start date is 01.11.2006 and my first posting date is 01.06.2009, the first time i perform postings, the system posts only one month cost, which is what i want. But then, if i change something on the condition - for example the price, the system backdates and calculates the difference dating from 01.11.2006 - it totally ignores my "valid from" date on the condition tab and calculates the correction from 01.11.2006.

Is there somewhere in SPRO a validity check setting or something that i could activate to deal with it.

Any help would be appreciated