Billing document posted in FI without doc number

Dear all,

I am facing a probem where I have the billing document but for some unknow reason have no FI document number.

When I check the table VBRK the document number is blank.

When I check the billing doc there is no FI posting, only in CO-PA

But when I check the document flow and the status overview the posting status is posted in FI

If I tryto realesed to Accounting I also got a message that was already posted. But I can not find the document.

Any idea how can I find it ?

Thanks a lot!