Search a variable in ABAP Source code from a particular package

How to search the variable in ABAP Source code from a particular package ,

Step 1 : Run the Program 'RS_ABAP_SOURCE_SCAN'.

Step 2 : Specify the variable in the 'String searched for' and select the checkbox shown below

Step 3 : Select the package you need to search for -

Step 4 : Execute that report program , it will show the lines of the abap code where that particular variable was used.