How to set default value in reference selector while updating a record

Hi I have a list view which is populating from the API, i have an edit option in the List view. While clicking on edit option, i am not getting previously selected value in the reference selector drop down. However it is showing all the values of that drop down.   
1 answers

Some check I would do:

  1. Is the reference selector using the same reference?
  2. Is there a selectable objects constraint set on the reference selector?
  3. Do you have access rights on the selected value?
  4. Does the data still exists?