How to use a integer on the Horizontal name attribute in a Heat map

Hi, i want to use a Heat map on the vertical as i want to have the name, on the horizontal the years as integer only i can't choose of a integer only string, does anybody know how to fix this?   If i select the horizontal name attribute:i don't see any integer    
1 answers

The widget is build to have the following specs:

Horizontal Name attribute  - type string

Horizontal Sorting attribute - type integer

If you want your Year integer as Horizontal Name attribute in this widget you could create a new attribute in your entity and store your Year integer as a string attribute.