Is it possible to update a member of a location hierarchy through a worksheet?

Hi,

We have a requirement from the user that will allow them to manually update the Key Customer level of a Site through a worksheet after the location had been interfaced to Demantra. I created a worksheet with Aggregation levels Account and Site. There's only one series "Key Customer" that is updateable on this worksheet. I was able to display the key customer editable cells, however, there are some Sites where the cell is NOT editable. Am I missing anything?

I've attached a screenshot of the worksheet.

Any help is greatly appreciated.

Thanks,

Marlon