How to display system calculated rating, if manager doesn't enter any rating manually?

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Hi All,

We have a requirement where we want to use both System Calculated Rating and Manual Rating, if manager doesn't enter rating in overall summary section manually, system should accept calculated rating.

In the overall summary section we have enabled "Enable manual section rating" with section processing role option "Optional Without Warning". Now the problem with this approach is, if manager doesn't enter rating manually in overall summary section, system is not accepting calculated rating and also rating doesn't appear on the performance document section as shown in the image.

Is there any solution or workaround for this requirement?