Mapping issue with CSV import to update existing data

[deb]

I am trying to update story points for a project via the Admin csv import. Here is a sample of the csv:

issue key,Summary,story points
DWT-5,,5
DWT-1,,10

On the mapping screen the below happens:

Why aren't the fields listed separately for mapping?

[Tony Rossiter]

@deb 

The import/update tool will require a value in the summary field.  Can you include it in the CSV and try again?  I expect that will fix it.

[deb]

I will try it, but why is it required? According to the documentation example  for "Update existing issues" the summary entry can be empty. Here's the examples given (see row 3)

issue key,summary,votes,labels,labels
TT-1,Original summary,1,label1,label2
TT-1,,7,label-1,label-2
TT-1,Changed summary,,,
TT-2,Original summary 2,1,label-1,label-2
TT-2,,<<!clear!>>,<<!clear!>>,   

[deb]

Adding Summary value did not help:

[Tony Rossiter]

I can't honestly say.  I don't have any first-hand experience with this exact use case where you're updating fields for some records but not all and to get around the Summary requirement issue on most imports I just always include it.  

Hope including the summary values fixes it :D

[deb]

Thanks, but it did not help (see above). Hopefully someone will see this who has attempted an update like this.