Two Step Material Issue Vs One Step material issue

User has two different option to issue the materials for a work order in Oracle eAM, Those are 1.Two step material issue, 2.One step material issue

1.Two Step Material Issue: - System will Perform 

1. Material Allocation and then 
2. Material Issue 

Material Allocation will be performed as soon as eAM Work Order got Released and after that user need to perform the material issue for Self Service Page .. Store > Two Step material issue > Issue

Note: For Allocation to be triggered at the Time of Work Order Release , please make sure that Auto Allocate Flag is ON at the Material Order Line as well as Work Order Header ( In WO header it got defaulted from Parameter - Enable Material issue request ) 

2.One Step Material Issue:- we don't perform Allocation, user can directly issue the Material.

Another Advantage of One Step Material issue is , it let you do Over Issue