In a Production Order you will notice that Production Task ID's are not in sequence i.e. Supply Task ID and Make Task ID are not in sequence.
SAP Business ByDesign
Reproducing the Issue
1. Go to Production Control workcenter and Production Order View.
2. Select the Production Order and in Details check the Tasks tab.
You will notice that the Supply Task ID and Make Task ID are not in sequence.
Task ID is proposed by system randomly during run time.
You will have to follow Start Feasibility in Tasks tab i.e. start the task that is Green.
Once this Task is completed system will set the Start Feasibility to Green for the next task in sequence.
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