Spanish self invoices

Hi experts,

In our project we're finding problems with the selfinvoicing layout for our spanish company. We've set up the system to use self invoicing, the correspondence code is SAPE1 and the program is RFKORDES with a customized layout.

The problem is that we can print generated invoices in the system. We see this message "Print report RFKORDES in company code xxxx has not selected any data for SAPE1". We've debugged RFKORDES and it seems to select data from table BKORM, but no FI document is into this table...we're working over a SAP 4.6c solution.

Any idea? Thanks in advance.

Best regards