When transitioning an assembly from Approved to Under Editing, EPM will select all parts and sub-assemblies that are in the proper state. Is there a setting to only select the current assembly and drawing (if it exits)?
Unfortunately, it's an all-or-nothing deal. If you change the setting so that it doesn't check referenced files, it also won't check the referenced model of a drawing if only the drawing was selected, or vice versa.
I think you are looking for this thread? https://forum.solidworks.com/message/96664#96664