SAPUI5 with V4 - Batch reuests placed automatically without clicking on SAVE button

Question

I have an issue in my SAPUI5 project using V4 Model. Everytime I change a value in the input field, a batch request is placed automatically changing the value in the backend. We want to send all changes upon clicking SAVE button. Can you please tell what is that I am missing?

Regards, Phani.