Hello Swapnil,
in case mixed storage is allowed then you do not need to maintain any Mixed Storage indicator in your storage type master.
If you want to restrict the bin capacity just by the capacity points, keep the Capacity Check = "4".
Then your storage bin will have a capacity you define in the storage bin master.
Whatever product of whatever batch you putaway into the bin, capacity points will be consumed. The consumption is defined by the capacity consumption in Units of Measure for the BUoM in product master and quantity you putaway.
Then the limitation of what is to be putaway into the bin is maintained by fixed bin assignment.
I hope this is clear to you.
Regards,
Petr