RE: Business Central Extend Page- to Check Duplicate
The primary key in this table consist of these fields:
"Item No.", "Sales Type", "Sales Code", "Starting Date", "Currency Code", "Variant Code", "Unit of Measure Code", "Minimum Quantity"
So the system will automatically restrict two records with the same primary key.
So if sales code and unit of measure are the only thing you enter in your sales price list the system will handle this for you with out the need for the customization you ask for.