diff --git a/conf/output/test-output-87.json b/conf/output/test-output-87.json
index adbd9a8..c33d2b4 100644
--- a/conf/output/test-output-87.json
+++ b/conf/output/test-output-87.json
@@ -11,6 +11,13 @@
   "title" : "2000 Jahre Meilbrück : vom römischen Tempelbezirk zur modernen Raststätte; Von den Anfängen bis zum Ende der Römerherrschaft",
   "alternativeTitle" : [ "Zweitausend Jahre Meilbrück" ],
   "extent" : "Ill.",
+  "isPartOf" : [ {
+    "type" : [ "IsPartOfRelation" ],
+    "hasSuperordinate" : [ {
+      "id" : "https://lobid.org/resources/121t0146618"
+    } ],
+    "numbering" : "1"
+  } ],
   "publication" : [ {
     "startDate" : "1990",
     "type" : [ "PublicationEvent" ]
diff --git a/conf/rpb-titel-to-lobid.fix b/conf/rpb-titel-to-lobid.fix
index c7fdf73..7c6f668 100644
--- a/conf/rpb-titel-to-lobid.fix
+++ b/conf/rpb-titel-to-lobid.fix
@@ -157,6 +157,14 @@ if exists("inSeries[]")
   set_array("isPartOf[]")
   move_field("inSeries[].*", "isPartOf[].$append")
 end
+if exists("volumeIn")
+  unless any_equal("type", "Band") # not for Allegro
+    unless exists("isPartOf[]")
+      set_array("isPartOf[]")
+    end
+    move_field("volumeIn", "isPartOf[].$append")
+  end
+end
 if exists("isPartOf[]")
   unless any_equal("type", "Band") # also sets isPartOf
     set_array("temp")
@@ -173,8 +181,16 @@ if exists("isPartOf[]")
         copy_field("$i.numbering", "temp.$last.numbering")
       else
         split_field("$i.value", " ; ")
-        copy_field("$i.value.1", "temp.$last.hasSuperordinate[].$append.label")
-        copy_field("$i.value.2", "temp.$last.numbering")
+        if all_match("$i.value", "^http.+")
+          copy_field("$i.value", "temp.$last.hasSuperordinate[].$append.id")
+        else
+          copy_field("$i.value.1", "temp.$last.hasSuperordinate[].$append.label")
+        end
+        if exists("$i.numbering")
+          copy_field("$i.numbering", "temp.$last.numbering")
+        else
+          copy_field("$i.value.2", "temp.$last.numbering")
+        end
       end
     end
     move_field("temp", "isPartOf[]")