Hi Rentas,
I do agree with Sebastian suggestion,
Alternative approach would be, follow following approach for migration of Treasury deals from one instance to another one.
1) Extract migration deals related information from source system by using BAPI or BDC and save data (excel format) to your desktop.
2) Use same template to upload data in Target System by Using transaction Code TBB1_LC (If you don't want to hit GL balance).
3 ) In this approach we need to crate few abap program for the same.
BS