Field help (PPLENDDAT0) 

End date of the production plan.
This date is optional: if no date is specified, the production plan lines end at the last period defined in the fiscal year table of the context which serves as the basis for asset depreciation management in accordance with the method. OPE - Operation units.
If it is specified, the production plan ends at the last period which contains this end date. It must be later than or equal to the end date of the current period at the time of the entry.