Index: openacs-4/packages/acs-tcl/tcl/apm-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/apm-procs.tcl,v
diff -u -N -r1.114.2.16 -r1.114.2.17
--- openacs-4/packages/acs-tcl/tcl/apm-procs.tcl	17 Oct 2020 16:47:14 -0000	1.114.2.16
+++ openacs-4/packages/acs-tcl/tcl/apm-procs.tcl	19 Oct 2020 15:19:13 -0000	1.114.2.17
@@ -1124,9 +1124,27 @@
     {-package_key ""}
     {-parameter ""}
     {-parameter_id ""}
+    {parameter_id_legacy ""}
 } {
     Unregisters a parameter from the system.
+
+    @param parameter_id_legacy DEPRECATED: previous versions of this
+                               proc would specify parameter_id as an
+                               unnamed argument. This has now be
+                               changed to a flag, but the old syntax
+                               is still tolerated in old code. This
+                               will generate a warning though and will
+                               be dropped in future versions.
 } {
+    # Transitional code to support legacy definition of parameter_id
+    # specified as an unnamed argument.
+    if {$parameter_id_legacy ne "" &&
+        $parameter_id eq ""
+    } {
+        set parameter_id $parameter_id_legacy
+        ns_log warning "apm_parameter_unregister: use of unnamed argument is deprecated for this proc, please use -parameter_id flag"
+    }
+
     if { $parameter_id eq "" } {
         set parameter_id [db_string select_parameter_id {
             select parameter_id