Creation of Invoice in ecc system from SRM

Hi,

We are using SRM 7.0 and ECC 5.0.

When we post a invoice(without PO reference) the IDOC get transmitter.

The status of the invoice IDOC is successful ( status 53 ) but no invoice document gets created in the backend system.

Has any one got this problem before?

Please help

Thanks,

Vignesh