error message ERP_CO_OLC_E003 when clearing F-44

Hi,

my user want to clear down payment request with invoice outstanding using clearing account vendor (F-44).

But document can't be clear with message : Order xxx requires assignment to an operation number (ERP_CO_OLC_E003).

for information, invoice and down payment, have link with PO number. PO number assign to maintenance order xxxx for activity Plant.

I'm think to insert operation number when message appear. Is there any standard way to do this or enhancement?

Please, suggest me correct scenario to solving my problem?

Regards,

nov