Post upgrade to SAP CRM 7.0 EHP4, SP 14, Initial Load & Delta replication stopped from CRM to ECC

Hi all CRM Experts,

We have recently upgraded only our SAP CRM 7.0 QA system to 7.0 EHP4, SP 14 not SAP ECC.

We have only Business partner replication set up from SAP CRM to SAP ECC as, SAP CRM is source system for Business partner.

After upgrade to SAP CRM 7.0 EHP4, SP 14, Initial Load & Delta replication stopped from CRM to ECC.

I checked basic MW configuration and it is maintained properly, even SMQR & SMQS is also fine.

please let me know any one has suggestions/comments to resolve this middleware issue After upgrade to SAP CRM 7.0 EHP4, SP 14.

Thanking you in advance

Santosh