Hello Mohammad,
Things to be carefull about:
-Confirmation Date on sales document items, may get re-calculated as the shipping point may have less/more days now to do backward/forward scheduling
-If you are on a MTO environment, the start/finish date of the manufacturing order may change, as now you may have more/less days than previouslly estimated
-The MRP demand may change, now requesting certain product to be available (material Availability Date) either earlier or later
-Your "Route" (Transit Time) may be off and if you have any "D" Incoterms that drive revenue recognition at different times after PGI, then they may be off now that the date is different
FInal suggestion.... copy your client to a temporary sand box client, then do the change there and then try to ship some orders on the date that is/was marked as a holiday, also change some sales orders (anything that will re-trigger the scheduling like quantity or delivery date) and take a look not only to the sales document, but to the manufacturing order as well as get the MRP folks to be aware of the impact on their side ..... having the compare client, you will be able to see what happen in your production system vs. how it behaves on your new sandbox with the new calendar.
Hope this helps,
Ed
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