Index: openacs-4/packages/dotlrn/tcl/apm-callback-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/dotlrn/tcl/apm-callback-procs.tcl,v
diff -u -N -r1.17 -r1.18
--- openacs-4/packages/dotlrn/tcl/apm-callback-procs.tcl	9 May 2018 15:33:30 -0000	1.17
+++ openacs-4/packages/dotlrn/tcl/apm-callback-procs.tcl	5 Jul 2018 11:16:16 -0000	1.18
@@ -292,6 +292,15 @@
         2.5.0d3 2.5.0d4 {
             db_dml insert_group_rels {}
         }
+        2.10.0d1 2.10.0d2 {
+            set attribute_id [db_string get_attribute {
+                select attribute_id from acs_attributes
+                where object_type = 'dotlrn_member_rel'
+                and attribute_name = 'portal_id'} -default ""]
+            if {$attribute_id ne ""} {
+                attribute::delete $attribute_id
+            }
+        }            
     }
 }