Hi Olet,
Can you check the PO status in ECC, we can able to do the EGR for open POs only.
'or' else you can pull/push EGR against the open PO in to EWM again and check.
from Configuration part ' Code for Initiator of a Communication Chain' is mandatory to create the IBD in EWM,
Path : SPRO-Img-SCM Extended Warehouse Management-Extended Warehouse Management-Interfaces-ERP Integration-Delivery Processing-Map Document Types from ERP System to EWM
C K Reddy