How to add a validate method in AX 2012 SSRS report

1. Implement the contract class by SysOperationValidatable

public class ProjTransReportContract implements SysOperationValidatable

2. Add the validate method

public boolean validate()

{

    boolean             isValid = true;

    ;

    if (this.parmFiscalYear() == '')

    {

        // Fiscal year was not entered.

        isValid = checkFailed(strfmt("The fiscal year is required. Enter a defined fiscal year to continue."));

    }

    else if (this.parmProjId() == '')

    {

        // Project ID was not entered.

        isValid = checkFailed(strfmt("The Project Id is required. Enter a defined Project Id to continue."));

    }

    return isValid;

}