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cdb to oa conversion VIA missing

Simon87
Hi Folks:
Problem description: After doing CDB to OpenAccess translation on a design from IC5 to IC6, the VIAs in all layouts are missing, even I selected the “Detect vias automatically” and “Map via parameters” in Set library options. 
Environment: 
Cadence Virtuoso 6.1.6
IBM_PDK cmrf8sf V1.8.0.4DM
I know in CDB vias are like cellviews and could be placed as instances, and differs from that defined in OA, which are not instances. So anyone please tell me how to migrate them correctly? 
Thank you so much for your time.
Simon 

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