Identical L2 trims
This warning is to inform you of a potential issue you may have in your L2 XML trims. This error will almost certainly throw up a red flag in QC and most doubtably be rejected. It is perfectly acceptable to have some identical L2 values in cases such as cut backs in a dialogue scene. Dolby Vision is by design dynamic metadata meant to change on a per shot basis and so when a project contains too many identical L2 values, this will come up as a warning when checking the XML on Metafier. If this is indeed correct, you and the QC reporting may disregard this warning.
Fixing Identical L2 values
Go back to grading timeline, find the shot with the ID. and re-trim for L2
Check the L2 values shot by shot, watching the target display to make sure there's no bump in color and luminance.
Re-export the xml