remove field will cause articles cannot be edited

Hi, all,
I just found that if we remove fields that are using by some articles, these articles will not be able to edited in flexicontent. We still can see these articles in web page and use Joomla article manager to edit.
I have tried to create back the same field name, but still fail, when click the item link in flexicontent, it just show blank page.
I think have to create back the same field name with the same ID, but in flexicontent, there is noway to choose ID, when we create new field.
Anyone has any idea how to solve this problem?
Thanks!