MRP not consuming forecast

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MRP will not reduce the Sales forecast.  The forecast plan is set to use Sales / Purchase forecast.  MRP Reduction princile is set to  Sales/Purchase forecast.  Negative days vary according to lead time of coverage group.  Set up of master plan is to consider forecast. Forecast plan is set to 365 days.  Does it have something to do with the item coverage group?  The coverage group for this item is set to Requirement - 180 positive - 20 negative.

Any help would be appreciated.

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