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Similar to the posted solution.
Not really had much exposure to Predictive tools, so imagine my surprise when I got the answer :D
My results don't match the output given in the start file, but they do match the results in the solution file.
Note, the solution replaces null values with the monthly or annual value rounded to the nearest integer.
My results are very close to, but not exactly the same as, the provided forecast numbers.
Follow my solution file attached...