WC allows to set a different displayed name for a same attribute on separate subtypes, but it causes problems in some pages (ie : search results).
It should be usefull to support this possibility.
On tables where two or more subtypes are displayed with the same attribute but with different dispayed name, separate columns could be added in the view definition.
Use case :
1. Attribute "LENGHT" added to a subtype 1 with "Total Lenght" as displayed name
2. Attribute "LENGHT" added to a subtype 2 with "Max Lenght" as displayed name
3. Create 2 subtypes and set value for this attributes for both
4. Search this both subtypes and add attributes on the view definition
=> Only one column is displayed with one of the two displayed name.
Expected behaviour : allow to add two columns, one for each displayed name.
