Field help (DPRDUR8) 

It is mandatory that this field is entered when the loading rule for the target plan is either Gross value = Transfer price or Gross value = Net value template plan.
It is used to enter the depreciation duration taken into account at the level of the target plan: it can either be the Residual duration or the Renewal of the previous duration.
Note: in the case where the rule is Gross value = Net value template plan, the residual duration and the previous duration are those of the Template plan.