I'll just take you through the steps that work for me:
1. Create forcecast in Excel.
Column A is Part Number in text format.
Column B is Date in Custom Format (YYYYMMDD)
Column C is Qty in Number Format
(You were missing a 'Y' in the date format but I assume that was a typo. The #####'s may mean that your column is not wide enough to display, try widening it.)
2. Save spreadsheet as CSV(Comma Delimited) e.g. F:\DBAMFG\DEFAULT\SLSWEEK.CSV
3. In MR-A enter filename as above. Enter 'C' in 'Comma Delimited or Fixed Length?' field. Below that, in first column, enter 1 for Item Number row, 2 for Date row and 3 for Qty row. (This tells program where data is in your CSV file.) Second column is Zeros in all three rows.
4. Hit enter and your off. The only fluke I've seen is that data will not import if dates are prior to today's.