This scenario is applicable only if you are upgrading to Update 27 or a higher version.
Starting Update 27, the multiple values in the document review matrix columns are separated by a |. This replaces comma as the delimiter to avoid confusion when the column value includes a comma. When you upgrade, the system replaces any commas in the column values with a |. Hence, if you have an existing review matrix, you need to verify the column values in the review matrix and reselect the values.
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The document reviews will not be generated for the affected rows if the above change is not made after the upgrade.
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If you have any custom matrices or custom matrix rows, you need to verify the column values and manage the matrix accordingly after the upgrade.