Stage

	Type	Length	PK	FK		Mode			Mandatory		Remarks
				Table	Field	Read	Write	Delete	Create	Update
external stage code	STRING	80				X	X	X
last modified	DATE					X	X
model name	STRING	80	X	Global	model name		X
stage code	STRING	80	X			X	X	X	X	X
stage order	NUM					X	X
stage type	NUM					X	X		X		1 = end stage; 2 = coupled; 3 =  replenishment; 4 = depletion.
stage valid	BOOLEAN					X	X				Indicates if a stage is valid and can be used in AS. A stage is valid if it has at least one product group, at least one process resource group and if it is a coupled stage at least one tank resource group attached to it.