i recorded a scenario of adding ,its openin add page & enters all the data but failing to save

My guess, without seeing your scenario, is that there is a step or something missing in your automation or something in your automation recording that is not executing properly.  I'm assuming that you are using a keyword test to do so. Could you take a screenshot of your test and post it here? Or, if you recorded script code, please paste it here and we can help you debug it.

A couple of things to look at:
1) Turn on Visualizer during playback. That should give you screenshots of your test's interactions with the UI so you can see if it's clicking the right buttons

2) If you are testing something that has a very active/dynamic page, it is possible that, after your last data entry, the "save" button MIGHT not be immediately available. You might need to add delays into your tests or add some sort of detection step to make sure the save button is active before the click is attempted.

3) Verify that, on your data page, you haven't inadvertantly left out a "required" field. Easy enough to do in a recording.