diff --git a/src/lib/several-builder.hpp b/src/lib/several-builder.hpp
index 979f5d75f..31e2b19cd 100644
--- a/src/lib/several-builder.hpp
+++ b/src/lib/several-builder.hpp
@@ -242,8 +242,9 @@ namespace lib {
               }
             else
               {
+                E& oldElm = reinterpret_cast<E&> (src->subscript (idx));
                 Fac::template createAt<E> (tar, idx
-                                          ,std::move_if_noexcept (src->subscript(idx)));
+                                          ,std::move_if_noexcept (oldElm));
               }
             tar->cnt = idx+1; // mark fill continuously for proper clean-up after exception
           }
@@ -327,7 +328,7 @@ namespace lib {
       fillElm (size_t cntNew, ARGS&& ...args)
         {
           for ( ; 0<cntNew; --cntNew)
-            emplaceNewElm<I> (forward<ARGS> (args)...);
+            emplaceNewElm<E> (forward<ARGS> (args)...);
           return move(*this);
         }
       
diff --git a/src/lib/test/testdummy.hpp b/src/lib/test/testdummy.hpp
index 17ee98004..b55466e33 100644
--- a/src/lib/test/testdummy.hpp
+++ b/src/lib/test/testdummy.hpp
@@ -70,7 +70,7 @@ namespace test{
         : val_(v)
         { init(); }
       
-      Dummy (Dummy && oDummy)
+      Dummy (Dummy && oDummy)  noexcept
         : Dummy(0)
         {
           swap (*this, oDummy);
diff --git a/tests/library/several-builder-test.cpp b/tests/library/several-builder-test.cpp
index 14bfc45a5..55247aae3 100644
--- a/tests/library/several-builder-test.cpp
+++ b/tests/library/several-builder-test.cpp
@@ -87,6 +87,28 @@ namespace test{
           {
             return i+ii + explore(ext_).resultSum();
           }
+        
+        /// allow for move construction
+        Num (Num && oNum)  noexcept
+          : Num(0)
+          {
+            swap (*this, oNum);
+          }
+        Num&
+        operator= (Num && oNum)
+          {
+            if (&oNum != this)
+              swap (*this, oNum);
+            return *this;
+          }
+        
+        friend void
+        swap (Num& num1, Num& num2)  ///< checksum neutral
+        {
+          std::swap (static_cast<Dummy&> (num1)
+                    ,static_cast<Dummy&> (num2));
+          std::swap (num1.ext_, num2.ext_);
+        }
       };
     
   } // (END) test types
@@ -248,6 +270,26 @@ namespace test{
                         , builder.fillElm (20) );
             CHECK (10 == builder.size());
           }
+          
+          { // Scenario-2 : Baseclass and elements of a single fixed subclass
+            SeveralBuilder<Dummy, Num<5>> builder;
+            
+            Dummy dum;
+SHOW_EXPR(dum.getVal())
+            Dummy nem{move(dum)};
+SHOW_EXPR(dum.getVal())
+SHOW_EXPR(nem.getVal())
+            Num<5> no5;
+SHOW_EXPR(no5.getVal())
+            Num<5> ne5{move(no5)};
+SHOW_EXPR(no5.getVal())
+SHOW_EXPR(ne5.getVal())
+            
+            builder.fillElm(5);
+            CHECK (5 == builder.size());
+            
+            builder.emplace<Num<1>>();  ///////////////////////////////////OOO this should trigger an exception -> need to code an explicit check right at the start of emplaceNewElm()
+          }
         }
       
       
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index e2e603522..d3ec96505 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -82741,7 +82741,8 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </html></richcontent>
 <icon BUILTIN="messagebox_warning"/>
 <node CREATED="1717980838451" ID="ID_123345043" MODIFIED="1717980849735" TEXT="hab es jetzt vorerst doch wieder dorthin geschoben"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717980850354" ID="ID_1951694568" MODIFIED="1717980857530" TEXT="TODO: bessere L&#xf6;sung finden">
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1717980850354" ID="ID_1951694568" MODIFIED="1718158733534" TEXT="TODO: bessere L&#xf6;sung finden">
+<linktarget COLOR="#ea004d" DESTINATION="ID_1951694568" ENDARROW="Default" ENDINCLINATION="456;43;" ID="Arrow_ID_13456577" SOURCE="ID_1048202028" STARTARROW="None" STARTINCLINATION="325;-27;"/>
 <icon BUILTIN="flag-yellow"/>
 </node>
 </node>
@@ -83375,9 +83376,43 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node COLOR="#435e98" CREATED="1718153109115" ID="ID_443086499" MODIFIED="1718153130346" STYLE="fork" TEXT="kein Typ mit anderem nicht-passenden Destruktor-Schema"/>
 <node COLOR="#435e98" CREATED="1718122010547" ID="ID_1757791910" MODIFIED="1718153130345" STYLE="fork" TEXT="nicht gen&#xfc;gend Storage und kann nicht verschieben"/>
 </node>
-<node CREATED="1718122030712" ID="ID_1960968889" MODIFIED="1718122040234" TEXT="Base + bekanntes E">
-<node CREATED="1718122066531" ID="ID_1633309056" MODIFIED="1718122076582" TEXT="kann wachsen (da move-ctor bekannt)"/>
-<node CREATED="1718122077386" ID="ID_959961694" MODIFIED="1718122087388" TEXT="kann keinen anderen Typ platzieren (selbst wenn kleiner)"/>
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1718122030712" ID="ID_1960968889" MODIFIED="1718158946391" TEXT="Base + bekanntes E">
+<icon BUILTIN="pencil"/>
+<node CREATED="1718122066531" ID="ID_1633309056" MODIFIED="1718122076582" TEXT="kann wachsen (da move-ctor bekannt)">
+<node BACKGROUND_COLOR="#c8c0b6" COLOR="#761b6d" CREATED="1718158865620" ID="ID_1008642521" MODIFIED="1718158939698" TEXT="erst mal mu&#xdf; Num&lt;5&gt; auch einen move-ctor haben">
+<icon BUILTIN="broken-line"/>
+</node>
+<node BACKGROUND_COLOR="#c8c0b6" COLOR="#761b6d" CREATED="1718158901756" ID="ID_1578123647" MODIFIED="1718158939699">
+<richcontent TYPE="NODE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      und der von Dummy mu&#223; <b>noexcept</b>&#160;sein
+    </p>
+  </body>
+</html>
+</richcontent>
+<icon BUILTIN="broken-line"/>
+</node>
+</node>
+<node CREATED="1718122077386" ID="ID_959961694" MODIFIED="1718122087388" TEXT="kann keinen anderen Typ platzieren (selbst wenn kleiner)">
+<node BACKGROUND_COLOR="#fafe99" COLOR="#fa002a" CREATED="1718157829884" ID="ID_1228814618" MODIFIED="1718157836660" TEXT="spricht nicht an">
+<icon BUILTIN="broken-line"/>
+<node CREATED="1718157847914" ID="ID_1926254706" MODIFIED="1718157851469" TEXT="Beobachtungen">
+<node BACKGROUND_COLOR="#f8f1cb" COLOR="#a50125" CREATED="1718157852441" ID="ID_1384707564" MODIFIED="1718157871000" TEXT="probeMoveCapability&lt;TY&gt;()  setzt gleich zu Beginn die move-Sperre">
+<icon BUILTIN="messagebox_warning"/>
+<node CREATED="1718158012556" ID="ID_240735780" MODIFIED="1718158019734" TEXT="das ist logisch falsch...."/>
+<node CREATED="1718158020275" ID="ID_1916533180" MODIFIED="1718158029781" TEXT="wir d&#xfc;rften diesen Punkt gar nicht erreichen"/>
+</node>
+<node BACKGROUND_COLOR="#fafe99" COLOR="#fa002a" CREATED="1718158031369" ID="ID_1048202028" MODIFIED="1718158733534" TEXT="Ja... hier fehlt ein expliziter Check">
+<arrowlink COLOR="#ea004d" DESTINATION="ID_1951694568" ENDARROW="Default" ENDINCLINATION="456;43;" ID="Arrow_ID_13456577" STARTARROW="None" STARTINCLINATION="325;-27;"/>
+<icon BUILTIN="broken-line"/>
+</node>
+</node>
+</node>
+</node>
 </node>
 <node CREATED="1718122252659" ID="ID_616405505" MODIFIED="1718122291873" TEXT="Triviale Typen">
 <node CREATED="1718122293022" ID="ID_697520417" MODIFIED="1718122302248" TEXT="kann wachsen"/>