obstruct generated by abstract generator is off the manufact

[renee]

When I finished the pin, extract, abstract, verify steps of the
abstract generator flow, there are some errors about
OBS :

**ERROR: (SOCLF-82): Macro "FRED" obs coordinate x value -7.1500
isn't on manufacturing grid. It's likely result in placement/routing
that can't be manufactured
**ERROR: (SOCLF-82): Macro "FRED" obs coordinate x value 5.7500 isn't
on manufacturing grid. It's likely result in placement/routing that
can't be manufactured

There are other similar errors about obs.

I don't know how the abstract generator generates the obstruct, and
which rules does it use when generates the obstruct.

Any help will be appreciated!