No invoice receipt is possible for Freight Order

Hi,

I am getting above error in MIRO when doing LIV:

Message no. M8_2089

Diagnosis

For  Freight Order no invoice receipt is possible.

System Response

For the settlement of  Freight Order  the system generated an
internal purchasing document. No invoices can be posted to this purchasing
document. The purchasing document may be locked.

Procedure

Contact your system administrator.