I have noticed an issue during export functionality over Columns
Steps to reproduce
1) login as system administrator
2) browse Column "M_Product_ID" of table "C_OrderLine" using window "Table and Column"
3) click on icon Export ans save as .zip 2pack file
4) open packout.xml and notice that content is missing, only root tag is exported.
Attaching a 2pack file for the reference.