diff --git a/Documentation/S3RISCinstall.tar.gz b/Documentation/S3RISCinstall.tar.gz
index 5a19f6d2..7cdbd315 100644
Binary files a/Documentation/S3RISCinstall.tar.gz and b/Documentation/S3RISCinstall.tar.gz differ
diff --git a/EOS_news.txt b/EOS_news.txt
index e476cc4b..6633bbd3 100644
--- a/EOS_news.txt
+++ b/EOS_news.txt
@@ -36,3 +36,4 @@
 2020-12-31 Modules, ORS, ORG, ORP, ORL, ORX, ORTool, Oberon0 - Add module finalization as a language construct (symbol FINAL)
 2021-01-24 ORTool - Decode FLR, FLT, RTI, STI, CLI instructions
 2021-04-12 In, Out - In added, Out updated
+2021-06-11 ORB - Allow hidden re-imports to coexist with declarations of identifiers or module aliases with the same name
diff --git a/README.md b/README.md
index c3b64ed4..f64240dc 100644
--- a/README.md
+++ b/README.md
@@ -14,9 +14,9 @@ Features
 * Import any number of modules
 * Simple batch execution facility
 
-**Last release:** 19.5.2021
+**Last release:** 11.6.2021
 
-**Last update:** 19.5.2021
+**Last update:** 11.6.2021
 
 The file [**S3RISCinstall.tar.gz**](Documentation/S3RISCinstall.tar.gz) always reflects the *latest* version of Extended Oberon, as described in the file [**EOS_news.txt**](EOS_news.txt).
 
diff --git a/Sources/ORB.Mod b/Sources/ORB.Mod
index fa02c3ed..578e0a41 100644
--- a/Sources/ORB.Mod
+++ b/Sources/ORB.Mod
@@ -72,7 +72,7 @@ MODULE ORB;   (*NW 25.6.2014  / AP 4.3.2020 / 5.3.2019  in Oberon-07 / AP 13.5.2
   PROCEDURE NewObj*(VAR obj: Object; id: ORS.Ident; class: INTEGER);  (*insert new Object with name id*)
     VAR new, x: Object;
   BEGIN x := topScope;
-    WHILE (x.next # NIL) & (x.next.name # id) DO x := x.next END ;
+    WHILE (x.next # NIL) & ((x.next.name # id) OR (x.next.class = Mod) & ~x.next.rdo) DO x := x.next END ;
     IF x.next = NIL THEN
       NEW(new); new.name := id; new.class := class; new.next := NIL; new.rdo := FALSE; new.dsc := NIL;
       x.next := new; obj := new
@@ -84,7 +84,7 @@ MODULE ORB;   (*NW 25.6.2014  / AP 4.3.2020 / 5.3.2019  in Oberon-07 / AP 13.5.2
     VAR s, x: Object;
   BEGIN s := topScope;
     REPEAT x := s.next;
-      WHILE (x # NIL) & (x.name # ORS.id) DO x := x.next END ;
+      WHILE (x # NIL) & ((x.name # ORS.id) OR (x.class = Mod) & ~x.rdo) DO x := x.next END ;
       s := s.dsc
     UNTIL (x # NIL) OR (s = NIL);
     RETURN x
@@ -184,18 +184,19 @@ MODULE ORB;   (*NW 25.6.2014  / AP 4.3.2020 / 5.3.2019  in Oberon-07 / AP 13.5.2
     VAR mod: Module; obj, obj1: Object;
   BEGIN obj1 := topScope; obj := obj1.next;  (*search for module*)
     WHILE (obj # NIL) & (obj(Module).orgname # orgname) DO obj1 := obj; obj := obj1.next END ;
-    IF obj = NIL THEN (*new module, search for alias*)
-      obj := topScope.next;
-      WHILE (obj # NIL) & (obj.name # name) DO obj := obj.next END ;
+    IF obj = NIL THEN (*new module*)
+      IF decl THEN obj := topScope.next;  (*search for alias*)
+        WHILE (obj # NIL) & ((obj.name # name) OR ~obj.rdo) DO obj := obj.next END ;
+        IF obj # NIL THEN ORS.Mark("mult def") END
+      END ;
       IF obj = NIL THEN (*insert new module*)
         NEW(mod); mod.class := Mod; mod.rdo := FALSE;
         mod.name := name; mod.orgname := orgname; mod.val := key;
         mod.lev := nofmod; INC(nofmod); mod.type := noType; mod.dsc := NIL; mod.next := NIL;
         obj1.next := mod; obj := mod
-      ELSIF decl THEN (*module already present, explicit import by declaration*)
-        IF obj.rdo THEN ORS.Mark("mult def") ELSE ORS.Mark("conflict with re-import") END
-      ELSE ORS.Mark("conflict with alias")
       END
+    ELSIF decl THEN (*module already present, explicit import by declaration*)
+      IF obj.rdo THEN ORS.Mark("mult def") ELSE ORS.Mark("invalid import order") END
     END ;
     RETURN obj
   END ThisModule;
diff --git a/Sources/System.Mod b/Sources/System.Mod
index d2ee6f95..6868bdca 100644
--- a/Sources/System.Mod
+++ b/Sources/System.Mod
@@ -1,8 +1,8 @@
-MODULE System; (*JG 3.10.90 / NW 12.10.93 / NW 20.6.2016 / AP 19.5.21 Extended Oberon*)
+MODULE System; (*JG 3.10.90 / NW 12.10.93 / NW 20.6.2016 / AP 11.6.21 Extended Oberon*)
   IMPORT SYSTEM, Kernel, Disk, FileDir, Files, Modules,
     Input, Display, Viewers, Fonts, Texts, Oberon, MenuViewers, TextFrames;
 
-  CONST Version* = "Extended Oberon System  AP 19.5.21";
+  CONST Version* = "Extended Oberon System  AP 11.6.21";
     StandardMenu = "System.Close System.Copy System.Grow Edit.Search Edit.Store | System.Expand System.Spread System.Clone";
     LogMenu = "Edit.Locate Edit.Search System.Copy System.Grow System.Clear | System.Expand System.Spread System.Clone";
     SystemLog = "System.Log"; SystemTool = "System.Tool"; SystemBatch = "System.Batch";