Problems with PO creation in SRM in Plan Driven Scenario

Hi experts,

I have a problem with creation of PO from SC in SRM 5.0 (Extended Classic) in Plan Driven Scenario:

We transfer PM order from FI/LO (ECC 5.0) to SRM (the Extended Classic is activated).

SC (External req) is being approved

After approval there is a status on each SC position: "Item in transfer", after a long time status is being changed to "Error in transmition".

PO is not created and I don't know why. Any ideas?

Regards

RafaD