Hi Robin,
In order to use new correspondence framework (FTR_COMONI), you have to activate Business Function FIN_TRM_CORR_FW first.
Have a look at SAPHelp: http://help.sap.com/ERP2005_EHP_04/helpdata/EN/A5/76B14766BA4C559F772213C9018AD4/frameset.htm
Best regards,
Piotr Icha