How to switch the production to an alternate organization?

Summary:

My scenario is that an item 1 demand is in ORGANIZATION SR1.It is made in this org Using a resource A.I made the resource unavailable for 10 days.
Now, i want to make this item in 2nd organization named ST1 to fulfill demand using its own resource B.
I have made the FOLLOWING sourcing/assignments sets;
Item 1 =SR1=100%=Rank 1=Make
item 1=ST1=100%=RANK 2=Make
But the system is not considering the 2nd Organization ST1 for production.
Below are the Screenshots attached of Sourcing rules and Plan output;