Unable to cancel the invoice

Hi Experts,

My user has created one invoice (MIRO) for regular vendor.

It was created as below:

Unfortunately, there were no accounting documents have been made.

Dont know what is the reason and why acc. docs not generated. Actually, the PO's are created against Sales "E".

As there were no acc.docs, user wants to cancel the invoice and repost it. But, system not allowing to cancel it as there are no acc. docs.

Error: F5A009

Can anybody suggets the solution for the same. Its urgent

Thanks,

Dhivya