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LVS not able to read layout with hierarchy.

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Hi
 anyone know what happen why lvs result show it missing basic cell like P_18_ICS_MM . please advice.
1. (without schematic hierarchy) We create new layout for SL_PARINV.  As yau can see below. LVS result for  SL_PARINV it self is clean.

2. (with schematic hierarchy) We create new SL_PARINV with hierarchy schematic.and the lvs result show it missing
 basic cell like N_18_CIS_MM. from my point of view its like the lvs not able to read connection from layout that have hierarchy.
please advice.
regards
Faisal.

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