Invoice/billing document not appearing on document flow of contract

Hi! We have one contract which we found billing document not appearing on the document flow and is showing as not invoiced on the billing screen even though the billing document is already fully invoiced and we can see it in both CRM and ECC and with reference to the contract.

Upon checking the BDOC (for type beabilldoccrmb), I found an entry for this billing document with status 'Received (intermediate state)'. It is in Yellow. When I click to show the error message, it says 'No receivers or error segments for BDoc message xxxx'. So, I have no clue as to what is wrong. I tried re-processing the BDoc but it hangs and nothing seemed to happen.

Does anyone know how the status of the billing document can be updated in the contract? Can anything be done on the BDoc side to update it?

Appreciate any help on that.

Regards

SF