Hi muhammadbilal,
Unable to save transactions is sometimes caused by browser issues. Let's try to save the cheques through a private browser.
- Google Chrome: press Ctrl + Shift + N
- Mozilla Firefox: press Ctrl + Shift + P
- Internet Explorer: press Ctrl + Shift + P
- Safari: press Command + Shift + N
If you're able to save them from there, please go back to your regular browser and clear the browser's cache. This will help refresh the online program's performance. Otherwise, you can switch to a different browser.
Let me know if you need anything else. We'll be glad to help.