Index: openacs-4/packages/project-manager/tcl/project-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/project-manager/tcl/project-procs.tcl,v
diff -u -N -r1.29 -r1.30
--- openacs-4/packages/project-manager/tcl/project-procs.tcl	12 Mar 2006 16:54:58 -0000	1.29
+++ openacs-4/packages/project-manager/tcl/project-procs.tcl	12 Mar 2006 19:15:07 -0000	1.30
@@ -1761,12 +1761,14 @@
     @error 
 } {
 
-    db_dml insert_assignment {
-        insert into pm_project_assignment
-        (project_id, role_id, party_id)
-        VALUES
-        (:project_item_id, :role_id, :party_id)
+    if {![db_string role_exists "select 1 from pm_project_assignment where project_id = :project_item_id and role_id = :role_id and party_id = :party_id" -default 0]} {
+	db_dml insert_assignment {
+	    insert into pm_project_assignment
+	    (project_id, role_id, party_id)
+	    VALUES
+	    (:project_item_id, :role_id, :party_id)
         }
+    }
 
     # We need to give the user permission. Leads will get "Admin". Players "Write" 
     # and watchers get "read".