Material provision indicator in maintenance order

Hi experts,

I am trying to map the scenario of sending equipment or material to vendor place for repair by putting control key as "PM03" in operation , flagging sub-contracting check box , entering material no in component tab page.Can anyone please explain about the significance of material provision indicator & in my screen only two indicators K & L is populated ? what are the other indicators & how to populate those? My cutomer somtimes use to send spares also along with equipment. please explain in details.I am working in ERP6.0 EHP4 .

thanks in advance.

rgds

rajib