How to know my promotion priority control?
Priority control only apply to Item Price, Item Group Price & Item Type Price.
Higher priority value means higher priority.
Promotion A, Priority = 0, Item ABC = 4.00
Promotion B, Priority = 2, Item ABC = 4.50
Promotion C, Priority = 3, Item ABC = 5.00
During transaction the system shall select = 5.00
By: CK 20200513, Jacky 20200519, P20200519 
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