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Sigrity Aurora help to simulate pi-filter on board file

ar100

Hello, 

I am trying to simulate a pi-filter circuit from my board file but I am getting this warmings message whenever i right-click on the power net to bring up TopXplorer: 

Dc pin @@LH13.2 has no voltage info; the pin will be open circuited.

Dc pin @@CH461.1 has no voltage info; the pin will be open circuited.
Dc pin @@CH460.1 has no voltage info; the pin will be open circuited.
No DC voltage property is defined for net PVDDO_PLL_DDR_CH3_CHM0 which has power or ground pins.
Please add VOLTAGE property to this net, or correct the pin types.
Dc pin @@GMN0.V34 has no voltage info; the pin will be open circuited.


As a result, TopXplorer is not able to extract the circuit. After i edit the net property to add a VOLTAGE property, then the power net 
disappears from the Signal Integrity-> Electrical Properties list in the Allegro Constraint Manager. 

Do you have any suggestion on how to fix it? Thanks


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