Hello,
let me explain all the steps followed.
Master Planning - Periodic - Generate statistical baseline forecast
once the batch is complete
Master Planning - Periodic - Session log
I select the last entry and click on the hyperlink of the file generated.
It is an Excel file with a pivot table containing the forecast
I add in the rows the product field, and I copy all the cells in a different tab, make the changes I need on the quantities and paste back on the pivot.
Typically the pivot is updated, and I select In the Excel menu:
Pivot table analyze - olap tools - what if analysis -publish
Though this time once I paste the values I get the error provided in the screenshot.
Does it help?
Let me know