Rules: How to get the value of a referenced entity and set this value in a variable

Hi Drupalers, 

another time, I am having my troubles with the Rules module. I hope someone can help me:
 
I´ve got the following use case: 
1. Content type: Bought goods, that has the field “product_id_bought” as a text field
2. Content type: Sold goods: It has the field “product_id_sold” as a text field and it has an entity reference to the field “product_id_bought”. The problem is that it saves the value of the title of the bought goods into this entity reference, but what I need is that the value of the referenced “product_id_bought” is saved into the “product_id_sold”

For example, product_id_bought has the value “1234” then I want this value to be saved into “product_id_sold” after content of the type “Sold goods” is saved. 

I already to make the field appear with “Entity is of bundle”, “Entity has field”, “Content is of type”, “User has field access”, but the field just doesn´t show up 🙁

Hope you guys can help me out, thank you very much in advance!

This is an export of my rule, with which I tried it already (I know it sucks that it is in German) Short explanation: verkaufen (sold) ankauf (bought): 

{ “rules_rechnungsnummer_verkauf_cloned_” : {
    “LABEL” : “Rechnungsnummer Verkauf (cloned)”,
    “PLUGIN” : “reaction rule”,
    “OWNER” : “rules”,
    “REQUIRES” : [ “rules” ],
    “ON” : { “node_insert–ger_t_verkaufen” : { “bundle” : “ger_t_verkaufen” } },
    “IF” : [
      { “entity_is_of_bundle” : {
          “entity” : [ “node:field-produkt-id-entity-referenc” ],
          “type” : “node”,
          “bundle” : { “value” : { “geraet_ankaufen” : “geraet_ankaufen” } }
        }
      },
      { “entity_has_field” : {
          “entity” : [ “node:field-produkt-id-entity-referenc” ],
          “field” : “field_produkt_id_entity_referenc”
        }
      },
      { “entity_has_field” : {
          “entity” : [ “node:field-produkt-id-entity-referenc” ],
          “field” : “field_produkt_id”
        }
      },
      { “node_is_of_type” : {
          “node” : [ “node:field-produkt-id-entity-referenc” ],
          “type” : { “value” : { “geraet_ankaufen” : “geraet_ankaufen” } }
        }
      },
      { “entity_field_access” : {
          “entity” : [ “node:field-produkt-id-entity-referenc” ],
          “field” : “field_produkt_id”,
          “account” : [ “” ]
        }
      }
    ],
    “DO” : [
      { “entity_fetch” : {
          “USING” : {
            “type” : “node”,
            “id” : [
              “node:field-produkt-id-entity-referenc:field-produkt-id-entity-referenc:nid”
            ]
          },
          “PROVIDE” : { “entity_fetched” : { “entity_fetched” : “Fetched entity” } }
        }
      },
      { “entity_query” : {
          “USING” : {
            “type” : “node”,
            “property” : “field_produkt_id”,
            “value” : [ “node:field-produkt-id-entity-referenc:field-produkt-id” ]
          },
          “PROVIDE” : { “entity_fetched” : { “entity_fetched_produktid” : “Fetched entity” } }
        }
      },
      { “data_set” : {
          “data” : [ “node:field-produkt-id-entity-referenc” ],
          “value” : [ “entity-fetched-produktid:0” ]
        }
      }
    ]
  }
}

Drupal version: 


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