During importing the test case, the User Story ID provided in the excel is not getting linked

While importing the test case, in the excel if I give the User Story ID or Requirement ID its not getting linked. I checked by mapping the User Story ID to Issue link type or Parent ID then also requirement is not getting linked to the imported test case. Is there any other field in Zephyr Squad apart from Issue link type or Parent ID, which we need to map with the User Story ID to get linked to the test case?