i assume you use the OOTB iTNC Oem layer for your post. In general i create new post without the OOTB layers because this layers are optimized for the OOTB sample machines. The reason is that these layers can contains procedures or LIB entries which maybe make your customization diffucult for this.
When you take a look at the Buffer name then it's named with MOM_tool_change_LIB_ENTRY_start. That means that a entrypoint is used in one of the additional layers, in that case in the OEM layer. The reason why it's difficult to change it is that the content of this procedure is not written in a Buffer and so you only see this default tag. So you have 2 possibilities. Remove the OEM layer from your post and add your own entries or overwrite the existing LIB_ENTRY with your procedure in the service file. I mean you get all the informations from the debugging output which template is used for each line. To make your life a little bit easier you can use just this one here: