SE71 sapscript module for invoice printout; changing the logo

Hi,

I would change the logo in a printout of a sapscript.

I verified in SE71 and I found the module of the invoice which should be modified

I tried to modify the logo but I can see the following:

/: INCLUDE ZLOGOINV OBJECT TEXT ID ST

My question is where can I find this "ZLOGOINV", don't know where has been stored?

Thanks

Best regards