Use
Invoice numbers assigned twice

Note
The program creates a list which displays all documents per accountnumber of the vendor or the customer, which occur within a referencenumber repeatedly, that is if a duplicate invoice exists.
Via available parameters and selection criteria, a refinement of thehard copy can be reached that is it is possible to make a restriction ofthe selection on the desired entry.
The hard copy contains the account number and the corresponding itemswhich contain the following specifications:
Document number, line item, entry date, document date, referencenumber, name of the recorder, posting key with sales indicator, amountin house or foreign currency and the corresponding currency key.
ith new account number additionally the name and the street address
f the corresponding vendor and/or the customer is output.