Errors when trying to import forecast - AX2012 R3 CU10

Hello, 

We are trying to use the forecast functionality as described in the Microsoft White Paper (https://www.microsoft.com/en-ca/download/details.aspx?id=43128)

So created the item allocation key, generated successfully the statistical baseline forecast, adjust the item quantity, pûblish back to cube and close excel. 

But when importing back the adjustments we have this error :

I searched and found this post regarding the same subject : https://community.dynamics.com/ax/f/microsoft-dynamics-ax-forum/286520/errors-when-trying-to-import-forecast/1111633#1111633

but it leads to Microsoft support, there are no  KB or hotfix. 

So I wanted to know If anyone here, succeeded to import back forecast for item allocation keys containing thousands of items. 

Regards, 

Mourad. 

PS: the import succeeds when I try with one item 

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