Hi Ashwani,
Try to cif all the materials, workcentres again and check if they are available in APO system.
CIF the SNP PDS later, you would be able to see the PDS in APO system.
To check the cif error , you can either see it in the outbound queue or you can even check it while ciffing PDS.
For more information kindly go through the below link.
Production Data Structure in SNP - Master Data for Supply Network Planning - SAP Library
Hope this helps.
Regards,
Jyoti