curl --location --request DELETE '/open_api//relation//' \
--header 'X-PLUGIN-TOKEN: {{plugin_token}}' \
--header 'X-USER-KEY: {{user_key}}' \
--header 'Content-Type: application/json' \
--data-raw '{
"relation_work_item_id": "301228xxxx",
"relation_rule_id": "720286429011250xxxxx"
}'
{
"data": {},
"err": {},
"err_code": 0,
"err_msg": ""
}