Hi Venkat,
What is the Release and SPS level you have applied to ABAP Stack and Java Stack here?
Can you please refer the following SAP Notes and check whether it helps you:
1737417 - BEx Web 7.x: upload selections from file or clipboard
1781924 - BEx Web 7.x: selector dialog enhancements and usability
2064268 - BEx Web 7.3x: Support for multiple hierarchy node selection
1887762 - BEx Web 7.x: updated selector dialog enhancements
Also, please refer the following SAP KBA Note:
1899396 - Patch Level 0 for BI Java Installation - Detailed Information
Thanks & Regards,
Sapna