You can use "of" or "for", but not "to". (if the system deals with customer complaints) If the system is being changed because of the complaints, but the system is about something else, "to" is fine.
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A Cornish PastyYou can use "of" or "for", but not "to". (if the system deals with customer complaints)Thanks.
If the system is being changed because of the complaints, but the system is about something else, "to" is fine.