Hi Yogeesha,
MRP Results are not coming back to ECC via CIF as material status in ECC won't be allowing to create purchasing documents in ECC.
Please check the SPRO Settings in ECC for this plant specific material status under "Define Material Status" - Currently it will be setup as B(error). You can change that to A (warning) and then test it out. Planning results will be able to come back to ECC from APO - only warning messages will be there in CIF logs.
Hope it helps.
Regards,
Alok