AA

The system is settling an AA contract, and overdrawing the repayment account and putting it in UNC.
What could be causing this??

I need to set up Trade Finance based loans in AA which were previously on LD module like FIM, FATR, Export Packing Credit, Export Bill Discounting, Export Financing in which we can be able to link the TF series LC Number, Contract Number and MD Guarantee Number To The Product. How Should I Approach It?