VIM with specified auth URL already exists

test1:
1. first make a clean table in database tacker
2. create a vim, for example: tacker vim-register --config-file vim-member.yaml --description desc-vim-member name-vim-member
3. create a vim the same step 2,except name, for example: tacker vim-register --config-file vim-member.yaml --description desc-vim-member name-vim-member-1

then, error informations: "VIM with specified auth URL already exists. Cannot register duplicate VIM"

test2:
1. first make a clean table in database tacker
2. create a vim, for example: tacker vim-register --config-file vim-member.yaml --description desc-vim-member name-vim-member
3. delete the vim
4. create a vim the same step 2,except name, for example: tacker vim-register --config-file vim-member.yaml --description desc-vim-member name-vim-member-1
5. create a vim the same step 2,except name, for example: tacker vim-register --config-file vim-member.yaml --description desc-vim-member name-vim-member-2

then, you can create all successful.