Hi Anil,
The standard SAP flow to find the storage bin is like
Step 1 : Pick the Stock removal / storage section / special movement value from material master WM1 view
Step 2 find the entry from T334T table the based on the above detail as well as Process (Removal A)
Step 3 Once it finds the Storage type then it checks the storage bin from where stock can be picked
In your above case i can see one user exit is active for Storage type FSS could you please check whether that is passing the right value or not