root@astbuntu:/var/src# diff -uNr asterisk-1.2.19/cdr.c asterisk-1.2.21.1/cdr.c 
--- asterisk-1.2.19/cdr.c       2007-05-18 17:56:20.000000000 -0300
+++ asterisk-1.2.21.1/cdr.c     2007-06-21 19:29:50.000000000 -0300
@@ -37,7 +37,7 @@
 
 #include "asterisk.h"
 
-ASTERISK_FILE_VERSION(__FILE__, "$Revision: 65172 $")
+ASTERISK_FILE_VERSION(__FILE__, "$Revision: 70948 $")
 
 #include "asterisk/lock.h"
 #include "asterisk/channel.h"
@@ -736,7 +736,8 @@
        newflag = ast_cdr_amaflags2int(flag);
        if (newflag) {
                for (cdr = chan->cdr; cdr; cdr = cdr->next) {
-                       cdr->amaflags = newflag;
+                       if (!ast_test_flag(cdr, AST_CDR_FLAG_LOCKED))
+                               cdr->amaflags = newflag;
                }
        }