diff --git a/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php b/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php
index 2797a76e9..14344d9f6 100644
--- a/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php
+++ b/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php
@@ -37,6 +37,8 @@ use Doctrine\ORM\Query;
 use Doctrine\ORM\UnitOfWork;
 use Doctrine\ORM\Utility\IdentifierFlattener;
 use Doctrine\ORM\Utility\PersisterHelper;
+use function array_merge;
+use function reset;
 
 /**
  * A BasicEntityPersister maps an entity to a single table in a relational database.
@@ -459,20 +461,13 @@ class BasicEntityPersister implements EntityPersister
             );
 
             $targetMapping = $this->em->getClassMetadata($this->class->associationMappings[$idField]['targetEntity']);
+            $targetType    = PersisterHelper::getTypeOfField($targetMapping->identifier[0], $targetMapping, $this->em);
 
-            switch (true) {
-                case (isset($targetMapping->fieldMappings[$targetMapping->identifier[0]])):
-                    $types[] = $targetMapping->fieldMappings[$targetMapping->identifier[0]]['type'];
-                    break;
-
-                case (isset($targetMapping->associationMappings[$targetMapping->identifier[0]])):
-                    $types[] = $targetMapping->associationMappings[$targetMapping->identifier[0]]['type'];
-                    break;
-
-                default:
-                    throw ORMException::unrecognizedField($targetMapping->identifier[0]);
+            if ($targetType === []) {
+                throw ORMException::unrecognizedField($targetMapping->identifier[0]);
             }
 
+            $types[] = reset($targetType);
         }
 
         if ($versioned) {
diff --git a/tests/Doctrine/Tests/ORM/Functional/Ticket/GH7062Test.php b/tests/Doctrine/Tests/ORM/Functional/Ticket/GH7062Test.php
new file mode 100644
index 000000000..1d7a2d7cb
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/Ticket/GH7062Test.php
@@ -0,0 +1,212 @@
+<?php
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+class GH7062Test extends OrmFunctionalTestCase
+{
+    private const SEASON_ID = 'season_18';
+    private const TEAM_ID   = 'team_A';
+
+    protected function setUp() : void
+    {
+        parent::setUp();
+
+        $this->setUpEntitySchema(
+            [
+                GH7062Team::class,
+                GH7062Season::class,
+                GH7062Ranking::class,
+                GH7062RankingPosition::class
+            ]
+        );
+    }
+
+    /**
+     * @group 7062
+     */
+    public function testEntityWithAssociationKeyIdentityCanBeUpdated() : void
+    {
+        $this->createInitialRankingWithRelatedEntities();
+        $this->modifyRanking();
+        $this->verifyRanking();
+    }
+
+    private function createInitialRankingWithRelatedEntities() : void
+    {
+        $team    = new GH7062Team(self::TEAM_ID);
+        $season  = new GH7062Season(self::SEASON_ID);
+
+        $season->ranking = new GH7062Ranking($season, [$team]);
+
+        $this->_em->persist($team);
+        $this->_em->persist($season);
+        $this->_em->flush();
+        $this->_em->clear();
+
+        foreach ($season->ranking->positions as $position) {
+            self::assertSame(0, $position->points);
+        }
+    }
+
+    private function modifyRanking() : void
+    {
+        /** @var GH7062Ranking $ranking */
+        $ranking = $this->_em->find(GH7062Ranking::class, self::SEASON_ID);
+
+        foreach ($ranking->positions as $position) {
+            $position->points += 3;
+        }
+
+        $this->_em->flush();
+        $this->_em->clear();
+    }
+
+    private function verifyRanking() : void
+    {
+        /** @var GH7062Season $season */
+        $season = $this->_em->find(GH7062Season::class, self::SEASON_ID);
+        self::assertInstanceOf(GH7062Season::class, $season);
+
+        $ranking = $season->ranking;
+        self::assertInstanceOf(GH7062Ranking::class, $ranking);
+
+        foreach ($ranking->positions as $position) {
+            self::assertSame(3, $position->points);
+        }
+    }
+}
+
+/**
+ * Simple Entity whose identity is defined through another Entity (Season)
+ *
+ * @Entity
+ * @Table(name="soccer_rankings")
+ */
+class GH7062Ranking
+{
+    /**
+     * @Id
+     * @OneToOne(targetEntity=GH7062Season::class, inversedBy="ranking")
+     * @JoinColumn(name="season", referencedColumnName="id")
+     *
+     * @var GH7062Season
+     */
+    public $season;
+
+    /**
+     * @OneToMany(targetEntity=GH7062RankingPosition::class, mappedBy="ranking", cascade={"all"})
+     *
+     * @var Collection|GH7062RankingPosition[]
+     */
+    public $positions;
+
+    /**
+     * @param GH7062Team[] $teams
+     */
+    public function __construct(GH7062Season $season, array $teams)
+    {
+        $this->season    = $season;
+        $this->positions = new ArrayCollection();
+
+        foreach ($teams as $team) {
+            $this->positions[] = new GH7062RankingPosition($this, $team);
+        }
+    }
+}
+
+/**
+ * Entity which serves as a identity provider for other entities
+ *
+ * @Entity
+ * @Table(name="soccer_seasons")
+ */
+class GH7062Season
+{
+    /**
+     * @Id
+     * @Column(type="string")
+     *
+     * @var string
+     */
+    public $id;
+
+    /**
+     * @OneToOne(targetEntity=GH7062Ranking::class, mappedBy="season", cascade={"all"})
+     *
+     * @var GH7062Ranking|null
+     */
+    public $ranking;
+
+    public function __construct(string $id)
+    {
+        $this->id = $id;
+    }
+}
+
+/**
+ * Entity which serves as a identity provider for other entities
+ *
+ * @Entity
+ * @Table(name="soccer_teams")
+ */
+class GH7062Team
+{
+    /**
+     * @Id
+     * @Column(type="string")
+     *
+     * @var string
+     */
+    public $id;
+
+    public function __construct(string $id)
+    {
+        $this->id = $id;
+    }
+}
+
+/**
+ * Entity whose identity is defined through two other entities
+ *
+ * @Entity
+ * @Table(name="soccer_ranking_positions")
+ */
+class GH7062RankingPosition
+{
+    /**
+     * @Id
+     * @ManyToOne(targetEntity=GH7062Ranking::class, inversedBy="positions")
+     * @JoinColumn(name="season", referencedColumnName="season")
+     *
+     * @var GH7062Ranking
+     */
+    public $ranking;
+
+    /**
+     * @Id
+     * @ManyToOne(targetEntity=GH7062Team::class)
+     * @JoinColumn(name="team_id", referencedColumnName="id")
+     *
+     * @var GH7062Team
+     */
+    public $team;
+
+    /**
+     * @Column(type="integer")
+     *
+     * @var int
+     */
+    public $points;
+
+    public function __construct(GH7062Ranking $ranking, GH7062Team $team)
+    {
+        $this->ranking = $ranking;
+        $this->team    = $team;
+        $this->points  = 0;
+    }
+}