Question: How can I fix a planning error within the Forecast Module?

(Example: User set a plan to build 800 pcs of a P/N in the forecast module for 1/29/07 a few weeks ago. Then found out they actually only needed 500 pcs for 1/29/07 and the other 300 pcs on 2/28/07). 

Answer: The forecast module does not allow for changes in the forecast for the current period, however, it does allow for changes in any future period, depending on the setup tolerances for how far out in the future the change is.

Suggestion:   You could open a SO for the near term activity and cancel the forecast. Then start a new forecast for future periods.