Subtask Dependencies Error Message "REF"

Christina

I am getting a "REF" message in the subtask cell for Predecessor column. 

 

For example: 

 

Line 3 Start SF, start date: 8/18/15; end date: 8/18/15 = I entered the number 2

 

Line 4 Update SF, start date: 8/19/15; end date:9/17/15 = I entered the number 3 

 

Line 5 Review SF, start date: 8/19/15; end date: 9/16/15 = I entered the number 4 and I get the "REF" error message

 

Line 5 is where I am having the issue and I do not understand. Please assist, thanks.

Brett Evans

Is line 4 a Parent Row?  That would cause a #REF error.  A predecessor needs to be a row with no children.