Tags are built during MRP Refresh, as a detailed trace between each recommendation and the demand(s) which triggered it. Tags are also created between replenishments and the demands which they are expected to fulfil.
If it is not clear why a recommendation has been created by MRP, use the View Tags screen to trace back to its source(s). It can also be used to see all higher-level demands, related recommendations from the same parent demand, and further recommendations or order resulting from the demand.
Demand orders can also be opened from within the screen.
