Hello,
if you did the upgrade from sap4.7 to SAP ecc6 , Use the transaction FIBF and delete the following BTEs;
00001025 FI-TAX create deftax_item
00001030 FI-TAX set deftax_item
00001040 FI-TAX create deftax_item_revers
00001050 FI-TAX create deftax_item_mr1m
or read note 913805
Regards.
Omar