How do I set up my source workbook so that the import assumptions tool automatically picks up the correct header column and data columns? I'm using a best-practice, non-modular workbook for the source data, which means there is an 'Up arrow' in column A; is this the cause why the suggested header row in the assumptions input tool is Column A?
Also, I have actual historical data sourced from SAP in a time series format starting in Column J, but the start colum for data import seems to be randomly chosen (starts in column Y)...