Patch Level issue

Hi Friends,

I am developing Addons for SAP B1 2007 version. From our development side, patch level is upgraded to PL 10. In my addon I am utilizing some new programming features available with the new patch. My doubt here is, if one of the client for whom I develop addon, has a SAP 2007 with a PL level lower than mine, what will be the effect of the new features I used in the addon. Please clarify my doubt. I am waiting for your answer.