Pivot Table Can't group that selection

Hi Experts,

Looked in archive and unable to figure out why I'm still getting error message I've filled in all blanks. I've tried all the suggestions, made sure there were no blank fields and that dates were populated.  Does it make a difference that the datasource populated by using vlookups?  Attaching sample file original data file is on the ISS tab a condensed version is on the SSI tab which is being used to populate the data for the pivot table which is on the SD tab.
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Can you add the attachment?
jmac001Author Commented:
Sorry, here is the attachment.

Change your formula in the SSI table, field 'SD Complete Forecast' to:
=IFERROR(IF(VLOOKUP([@[Store '#]],ISS!$C:$HX,21,FALSE)="",DATEVALUE("01/01/3000"),VLOOKUP([@[Store '#]],ISS!$C:$HX,21,FALSE)),DATEVALUE("01/01/3000"))
This converts your date to a 'proper' date.
In your file the year 3000 date was top of the pivot table list; now it is bottom.


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jmac001Author Commented:
Thank you so much!
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