执行CK44，会删除如下数据：
The administrative data for the costing run (name, description, selection and structure explosion) is deleted. The material cost estimates themselves are not deleted. You have to _deletethem in a second step CKR1.
执行CKR1，会删除如下数据：
When you _deletea material cost estimate, the following data is deleted: Basic costing data Cost component split Itemization Log
In test run mode, a list appears showing the cost estimates that can be deleted.
In the reorganization mode, the system issues a message detailing the number of cost estimates deleted.
也就是说，CK44只是能删除costing run的一些管理数据，对于costing run的结果（mark、realease）是没法删除的，如果要删除，必须用CKR1。
