code: public void removeRequirement(Requirement requirement) throws GreenPepperServerException
      {
          if(!requirements.contains(requirement) )
              throw new GreenPepperServerException( GreenPepperServerErrorKey.REQUIREMENT_NOT_FOUND, "Requirement not found");
  
          requirements.remove(requirement);
          requirement.setRepository(null);
      }
docs: <p>removeRequirement.</p>
  
  @param requirement a {@link com.greenpepper.server.domain.Requirement} object.
  @throws com.greenpepper.server.GreenPepperServerException if any.