Hi
You say you have a lot of complex FI-documents with several clearing documents. Advice would be to get business to create simple FI documents for 1 subject/expense only so that there is a more 1 to 1 assignment between actual document and final info document. The more complex the FI documents the more ambigious/erroneous the Liquidity Item determination will be and more user exits will be needed that can/will be unstable.