Dear Kumar,
First of all, thank you for your pictures. I think I can understand the difference between the strategies now. In my oppnions,the biggest difference is in the business, not in SAP. All operations of two strategies in SAP are too similar. Finally, I made a test just now. If I use bulk strategies, I also can use FIFO. But I think your explaination are correct, I can't use FIFO if I use bulk strategies in the business.
Thank you for your help again!