Hi Viswamurthy,
have you been able to call the original HANA DP without issues? Seems there is some issue in the SQLScript coding.
Can you try on the SQL Console a CALL "SAP<SID>"."<ABAP_CLASS>=><ABAP_MANAGED_PROCEDURE_NAME>" and post the error message? Or please attach the full Runtime Exception here.
Cheers,
Jasmin