When running the migration tool shipped by BPMS 6.1 against repository generated by BRMS 5.2, the following issue occurs:

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In 5.2, any rule that uses a java.util.Date produces the following line in the .rdrl file:
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("dd-MMM-yyyy");

During migration, however, the line is transformed to an invalid form that will throw exceptions at runtime:
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("null");

If I save the file via the 6.1 UI, the SimpleDateFormat line no longer exists in the rule. Since we have over a hundred projects, that is not necessarily a valid option.
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This bz is a split from bug 1216173 where all of the supporting attachments could be found.