Good day
@morteza ;
I looked a little closer at your OP. I now see that indeed, in the AIAG/VDA manual (page 163) as you describe, the form template does indeed use the exact verbiage you stated and it is not included in the optimization section. Confusing. As you will note on the referenced form, it states "optional" in this section. As you know, continuous improvement activities generally warrant an update to the
PFMEA. As with the change point control advice I mentioned previously in this post, I would recommend simply pointing to your current tracking number/method for identifying the continuous improvement (change point control) activity that was the impetus for the PFMEA change. (Indeed, results of continuous improvement generally result in a controlled change, therefore, the tracking reference may be the same).
Note: The CTS software (AIAG) does NOT have the fields you are describing.
Summary: However you choose to (or not---note the example you provided states "optional"), to use those fields on the PFMEA, be sure not to replicate/duplicate/contradict from existing documenting/tracking methods your organization may use or otherwise fragment information.
Hope this helps.
Be well.