diff --git a/xtraplatform-features-gml/src/main/java/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGml.java b/xtraplatform-features-gml/src/main/java/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGml.java
index 1140cafd8..608dcb016 100644
--- a/xtraplatform-features-gml/src/main/java/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGml.java
+++ b/xtraplatform-features-gml/src/main/java/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGml.java
@@ -1030,7 +1030,11 @@ private Optional<FeatureSchema> lookupChild(
     for (FeatureSchema p : parent.getProperties()) {
       String key = propertyKey(p, useAlias);
       String base = stripPrefix(key);
-      boolean suffixed = inputProfile.getObjectTypeSuffixedProperties().contains(base);
+      // The configured set holds property ids (technical full paths), not the on-the-wire
+      // name/alias, so membership is tested against the property's full path; the wire element
+      // base for the suffix match stays the name/alias the encoder emits.
+      boolean suffixed =
+          inputProfile.getObjectTypeSuffixedProperties().contains(p.getFullPathAsString());
       if (!(wireLocalName.equals(base) || (suffixed && wireLocalName.startsWith(base + "_")))) {
         continue;
       }
diff --git a/xtraplatform-features-gml/src/main/java/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGmlInputProfile.java b/xtraplatform-features-gml/src/main/java/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGmlInputProfile.java
index c64edbf07..2d7254a67 100644
--- a/xtraplatform-features-gml/src/main/java/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGmlInputProfile.java
+++ b/xtraplatform-features-gml/src/main/java/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGmlInputProfile.java
@@ -164,14 +164,15 @@ default String getFeatureMemberElementName() {
   Map<String, List<String>> getValueWrap();
 
   /**
-   * Reverse of {@code GmlConfiguration#objectTypeSuffixedProperties}: the name (or alias, when
-   * {@link #getUseAlias()}) of each FEATURE_REF property whose GML element on the wire is the base
-   * property name plus a {@code _<ObjectType>} suffix naming the referenced feature type (e.g. base
-   * {@code gehoertZuBauwerk} → {@code gehoertZuBauwerk_AX_Turm}). For these properties the decoder
-   * accepts an element whose local name is the base name optionally followed by a {@code
-   * _<segment>} suffix and maps it to the base property. The suffix is ignored: the referenced
-   * object type is carried independently through the FEATURE_REF join, so it need not be captured
-   * from the wire.
+   * Reverse of {@code GmlConfiguration#objectTypeSuffixedProperties}: the property id (technical
+   * full path) of each FEATURE_REF property whose GML element on the wire is the base property
+   * name/alias plus a {@code _<ObjectType>} suffix naming the referenced feature type (e.g. base
+   * element {@code gehoertZuBauwerk} → {@code gehoertZuBauwerk_AX_Turm}). Membership is tested
+   * against the property's technical full path, not its on-the-wire name/alias. For these
+   * properties the decoder accepts an element whose local name is the base name/alias optionally
+   * followed by a {@code _<segment>} suffix and maps it to the property. The suffix is ignored: the
+   * referenced object type is carried independently through the FEATURE_REF join, so it need not be
+   * captured from the wire.
    */
   Set<String> getObjectTypeSuffixedProperties();
 
diff --git a/xtraplatform-features-gml/src/test/groovy/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGmlSpec.groovy b/xtraplatform-features-gml/src/test/groovy/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGmlSpec.groovy
index 5daca3a24..1d6e08af3 100644
--- a/xtraplatform-features-gml/src/test/groovy/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGmlSpec.groovy
+++ b/xtraplatform-features-gml/src/test/groovy/de/ii/xtraplatform/features/gml/domain/FeatureTokenDecoderGmlSpec.groovy
@@ -520,14 +520,15 @@ class FeatureTokenDecoderGmlSpec extends Specification {
             ImmutableFeatureTokenDecoderGmlInputProfile.builder()
                     .useAlias(true)
                     .featureRefTemplate("urn:adv:oid:{{value}}")
-                    .addObjectTypeSuffixedProperties("istGebucht")
+                    // Declared by property id "11001-21008", not the on-the-wire alias istGebucht.
+                    .addObjectTypeSuffixedProperties("11001-21008")
                     .build()
 
     def 'objectTypeSuffixedProperties: a _<ObjectType>-suffixed element maps to the base feature-ref property'() {
         given:
-        // ALKIS NAS names this element adv:gehoertZuBauwerk_AX_Turm; istGebucht stands in here as a
-        // declared suffixed property. The _AX_Turm suffix is ignored and the href is reduced as for
-        // the plain element.
+        // ALKIS NAS names this element adv:gehoertZuBauwerk_AX_Turm; property "11001-21008" (alias
+        // istGebucht) stands in here as a declared suffixed property. The _AX_Turm suffix is ignored
+        // and the href is reduced as for the plain element.
         def decoder = newDecoder(axFlurstueckWithRefsSchema(), NAS_TEMPLATES_SUFFIXED)
         def xml = """<adv:AX_Flurstueck xmlns:adv="${ADV_NS}"
                 xmlns:gml="http://www.opengis.net/gml/3.2"