For some forecasting models, there are some minimum number of buckets required for initialization of the model and the actual calculation through ex-post. Can you tell us for the planning object you are forecasting, how many historical buckets with non-zero values actually exist ? IN transaction /sapapo/fcstoutl, can you try to check what happens on reducing the initialization zone. I am guessing you are getting this message on running a trend-seasonal model. You may also want to check your seasonality period. Ensure you have atleast 3+ 2 full seasons of history, if planning with trend seasonal.
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