Is there a limitation on the number of demand schedules that can be added to a Supply Plan?

Summary:

Is there a limitation on the number of demand schedules that can be added to a Supply Plan?

Content (required):

We have a single Constrained Supply Plan for doing the supply planning. Our planning cycle is normally quarterly and has a number of individual forecasts that are input to the supply plan.

Question: Is there a numeric limit on the number of Forecasts or Demand Schedules that can be added to a supply Plan? Is there an efficient way(like a concurrent program etc.) to delete old forecasts and demand schedules from the Supply Plan?

Version (include the version you are using, if applicable):