Events assocated with FPE1 to post additional line items

HI,

As per the business requiremnet for a SAP FS-CD ( collections and disbursement) project, i need to post additional Gl line items along with the BP line item and Gl line item while posting through FPE1 by looking at other table. Please let me know the event / user exit where in i can add logic. When i post, one BP line item and one GL line item will be generated. I need to create one more Gl line item under GL line item with the same valeus except GL account number and for Gl account number i need to look in other table.

Please let me know the events i can look for this.

Regards,

Maruthi.