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creo1 config.pro option documentation for: SAVE_INSTANCE_ACCELERATOR            

save_instance_accelerator

save_instance_accelerator
saved objects*, none, explicit, always
determines how instances are saved with the family tables of solid parts.
saved objects - saves instance accelerator files if,
  the instance is modified in one of the following ways.
o   feature redefinition
o   feature rerouting
o   reference replacement
o   feature reordering
o   component replacement
o   object integration
  the instance verification status is not set to failed.
  the instance verification status is set to unverified. in this case, when creating the accelerator file, creo parametric displays a message stating that the accelerator file was created for the nonverified instance.
none - does not save instance accelerator files.
explicit - saves instance accelerator files only when you explicitly save instances.
always - always saves instance accelerator files, regardless of whether you are saving an instance explicitly or through a higher-level object.
you can override this configuration option at runtime by clicking file M-^VM-6 instance operations, and clicking another command on the associated inst dbmsmenu.