Is there any way to delete the Forecast on basis of date.

we have API mrp_forecast_interface_pk, but it is deleting data from MRP_FORECAST_DATES based on org_ID and Forecast_Designator.
We need an addidtional date also, so that we can prevent current 2 weeks of forecast from being purged.

our requirement: we don't want to delete our present 2 week forecast, but we want to delete rest of the other forecast. Kindly let me know how it can be possible to do so.