MT940 -FF_5 Automatic clearing error

Dear Experts,

I have two payment documents with same value date and amount.

Ex: 200001415 31.08.2011 500 USD

200001768 31.08.2011 500 SGD

In MT940 i am getting the payment document number in the reference 86:.

I am using serach string wil alogortihm 001 standard algorithm with payment document.

When i import the bank statement while clearing the above two documents are coming at a time and not clearing.

Ex: Using the searching string the system finding payment document number 200001415, then while clearing the system is prposing the above two items together.

200001415 31.08.2011 500 USD

200001768 31.08.2011 500 SGD

Pleasssuee help to awnser if any body face the same i