Question for firmware information

Hello, 

I am trying to put firmware information. In DC, it has variable structure firmware_info_t to save the firmware information. Also there are some macro variables to save product name, firmware version and so on. I found them in stdBios.C. In firmware_info.lib, the note told user how to define them. However, when I put #define _FIRMWARE_NAME_ "TEST" at beginning of my main C code. It always give me an error "invalid redefine of macro '_FIRMWARE_NAME_". Anybody know what is happened? 

I am using DC10.72 and bl4s200.

Thank you in advanced.