Import Action issue

Hi Anaplanners,


There is something I need an assistance. I have created an action to import the data, and the Module is multi-dimensioned. During the creation of the action one of the dimension "Match on Names or Codes" is disabled, which means by default we have to match it manually. Can anyone please let me know why the option is disabled? Have attached the screenshot. The dimension is mapped to be "Column Headers".




Thanks You!!