List Validation in AX

List Validation in Report Contract Class Validate Method

public boolean validate()
{
    boolean ret;
 
     List            lstEntities = new List(Types::String);
   
    ret = true;

   
     lstEntities=this.parmEntity();
  if(!lstEntities.elements())
    {
        ret = checkFailed("@SYS330812");
    }
    }