Help for Conformal ECO

Hello everyone,

Currently, I  encounter some problems with Conformal ECO.

i have two designs A and B and I want design B can be logically same with design A after eco changes.
To describe more detailed for this, I want to keep the original structure of design B and added with some eco pins to become design A. But the new ecoed design conformal gave me is just a similar versions of design A. And the structure of design B is almost lost in the new design. I want the generated design is equivalent to design A but I don’t want the structure to be similar with design A. 

I know I can resynthesis the new design. But I have some important part in design B that needed to stay unchanged.

Does any one know how to fix this problem?

the dofile I used is shown below following the reference flow in the manual

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set eco option -flat set system mode lec

analyze hier_compare -dofile hier.do -eco_aware -replace add compared points -all compare

compare eco hierarchy report eco hierarchy -hierarchy

analyze eco "patch_%s.v" -hierarchical -ecopin_dofile ecopins.do set system mode setup dofile ecopins.do

apply patch -auto -NOKEEPHierarchy

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