change SAP CRM AET field buffer issue

When we create a new Sales Area and input some data in AET field and click cancel button, the AET value we just input is not cleared in the buffer managed by AET framework. So when later the save button is clicked, the AET value is still retrieved from buffer via method get_table_changes:

Since now there is one entry in table <lt_data_insert>, so AET framework will consider it as an insertion case:

And finally data is stored in DB via update function call:

Have a look whether they have done some cleanup task in cancel button implementation to clear the AET buffer ( maybe in class CL_BUPA_IL_AXT_SALES_TABLES ).
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