Using a fact whose class name is I18N, guided rule does not save rule correctly

Description of problem:
A rule order that has I18N name class is changed in Guided Rule Editor.

Version-Release number of selected component (if applicable):
Red Hat JBoss BRMS 6.0.1

How reproducible:
Write rules in RHS and reopen the DRL file.

Steps to Reproduce:
1. Write rules in RHS using Guided Rule Editor.
Created Source is:

1. | package mygroupid.myproject;
2. |
3. | import java.lang.Number;
4. | import sample.帽子;
5. |
6. | rule "MyGuidedRule"
7. | dialect "mvel"
8. | when
9. | then
10. | 帽子 fact0 = new 帽子();
11. | fact0.setサイズ( "L" );
12. | insert( fact0 );
13. | end

2. Save and close with X button.
3. Reopen the guided rule file and check source:

1. | package mygroupid.myproject;
2. |
3. | import java.lang.Number;
4. | import sample.帽子;
5. |
6. | rule "MyGuidedRule"
7. | dialect "mvel"
8. | when
9. | then
10. | fact0.setサイズ( "L" );
11. | 帽子 fact0 = new 帽子();
12. | insert( fact0 );
13. | end

Actual results:

1. | package mygroupid.myproject;
2. |
3. | import java.lang.Number;
4. | import sample.帽子;
5. |
6. | rule "MyGuidedRule"
7. | dialect "mvel"
8. | when
9. | then
10. | fact0.setサイズ( "L" );
11. | 帽子 fact0 = new 帽子();
12. | insert( fact0 );
13. | end

Expected results:

1. | package mygroupid.myproject;
2. |
3. | import java.lang.Number;
4. | import sample.帽子;
5. |
6. | rule "MyGuidedRule"
7. | dialect "mvel"
8. | when
9. | then
10. | 帽子 fact0 = new 帽子();
11. | fact0.setサイズ( "L" );
12. | insert( fact0 );
13. | end

Additional info:
I will attach my sample jar file.