| # History Retention Rules History retention rules determine how long LN retains historical asset data for each company. When you run the Period End (tffam8205m000) session, LN purges summary information older than the number of years you specify. You must set the years of summary history rule to a value greater than zero, or LN will purge all information, except the current period's information. The periods of asset history rule specifies the number of accounting periods for which you want to retain an asset after you have disposed it. When you run the Period End (tffam8205m000) session and the History Purge (tffam8208m000) session, LN purges assets that are fully-disposed and are older than the number of periods you specify. The periods of transaction history rules specify the number of accounting periods for which you want to retain historical data for capitalization, adjustment, depreciation, transfer, and disposal transactions. When you run the Period End (tffam8205m000) session and the History Purge (tffam8208m000) session, LN purges transactions older than the number of periods you specify for each type of asset transaction. Related topics Using Period End History Retention Rules Defining Depreciation Frequencies Using default books |