Drupal subrequest Using REST post 2 entities unrelated (anat

[

  {
    "requestId": "req-anathesi-REST post004.1",
    "uri": "/entity/anathesi_mathimaton_tmima/?_format=hal_json",
    "action": "create",
    "body": "{\n    \"_links\": {\n        \"self\": {\n            \"href\": \"http://localhost/drupal8test/admin/structure/anathesi_mathimaton_tmima/1?_format=hal_json\"\n        },\n        \"type\": {\n            \"href\": \"http://localhost/drupal8test/rest/type/anathesi_mathimaton_tmima/anathesi_mathimaton_tmima\"\n        }\n       \n    },\n    \"langcode\": [\n        {\n            \"value\": \"en\"\n        }\n    ],\n    \"_embedded\": {\n\n                \"http://localhost/drupal8test/rest/relation/anathesi_mathimaton_tmima/anathesi_mathimaton_tmima/mathima_id\": [\n            {\n                \"uuid\": [\n                    {\n                        \"value\": \"5d69e4a6-a5a4-462a-941f-e7f1ae3c8b2d\"\n                    }\n                ]\n            }\n\n        ],\n        \"http://localhost/drupal8test/rest/relation/anathesi_mathimaton_tmima/anathesi_mathimaton_tmima/tmima_id\": [\n            {\n                \"uuid\": [\n                    {\n                        \"value\": \"8cdbcc32-9a0b-437b-9e83-bf65d34fd7b7\"\n                    }\n                ]\n            }\n        ]\n    },\n    \"status\": [\n        {\n            \"value\": true\n        }\n    ]\n\n}"
,
    "headers": {
      "Accept": "application/hal+json",
      "Content-Type": "application/hal+json",
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}
   },

  {
    "requestId": "req-anathesi-REST post004.2",
    "uri": "/entity/anathesi_mathimaton_tmima/?_format=hal_json",
    "action": "create",
    "body": "{\n    \"_links\": {\n        \"self\": {\n            \"href\": \"http://localhost/drupal8test/admin/structure/anathesi_mathimaton_tmima/1?_format=hal_json\"\n        },\n        \"type\": {\n            \"href\": \"http://localhost/drupal8test/rest/type/anathesi_mathimaton_tmima/anathesi_mathimaton_tmima\"\n        }\n       \n    },\n    \"langcode\": [\n        {\n            \"value\": \"en\"\n        }\n    ],\n    \"_embedded\": {\n\n                \"http://localhost/drupal8test/rest/relation/anathesi_mathimaton_tmima/anathesi_mathimaton_tmima/mathima_id\": [\n            {\n                \"uuid\": [\n                    {\n                        \"value\": \"f4ec4671-0038-4026-9a6a-eee5ca9fcd91\"\n                    }\n                ]\n            }\n\n        ],\n        \"http://localhost/drupal8test/rest/relation/anathesi_mathimaton_tmima/anathesi_mathimaton_tmima/tmima_id\": [\n            {\n                \"uuid\": [\n                    {\n                        \"value\": \"8cdbcc32-9a0b-437b-9e83-bf65d34fd7b7\"\n                    }\n                ]\n            }\n        ]\n    },\n    \"status\": [\n        {\n            \"value\": true\n        }\n    ]\n\n}"
,
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      "Accept": "application/hal+json",
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