The solution to this will likely depend on what the selectors look like which you are getting out of the system.
Can you indicate one of the values in the Challan/Loading Vrno column and open it up in UiExplorer so show the detail, and take a screenshot of the UiExplorer window. Can you also do the same thing but indicating the checkbox to the left of the value.
The ideal scenario here is that the one or both of those selectors actually contain the value you wish to match against as an attribute of that selector. If so you can create a dynamic selector which uses your stored variable to click on the correct row of that value, by either clicking on the checkbox directly, or clicking on the value but with an offset so the click happens to the left of the value, in the checkbox you need.
Can you try to get the selector for the first field and then the second field using UiExplorer. There will be a small difference between then and that might be the row number. You can try a while loop and inside the while loop add first the element exist activity, Get Text activity and then a validation condition to check if your value matchs.
First try to get the selector of the first fiele which enablea you to extract the text.
@nirmalya.sarkar Can you please validate the selector by highlighting it. The selector coming in the UiExplorer is the window selector not the textbox selector.
Is the jave extension installed in your machine for the application?