How to edit gray boxes in Resource Usage Spreadsheet

Hi All,

I am trying to distribute hours using resource usage spreadsheet. some of the boxes have turned gray and i can not edit them.

Activities haven't started

actual hours are 0

budgeted hours = remaining hours

Refer to activity "Insert seismic bracing" in below snapshot.

screenshot_16-12.png

Duartion type is Fixed Units. All activities are fixed units and i was able to edit them. Its just these couple of activities.wysiwyg_imageupload:: [1]

screenshot_17-12.png