XF 2.2 Can't edit template modification


Well-known member
Hoping someone maybe able to help.
I need to add something in my postbit. I've gone into message_macros and found where I want to add the code, however another addon is also using this same spot via template modifications.

So I thought i'd go into the template modification and adjust the code so it will be underneath mine, however it says 'Only a limited number of fields in this item may be edited.' In fact, none of it can be edited! Any ideas on why this might be, or any kind of solutions at all? Worst case I suppose it's going to be a case of uninstalling, altering the xml file and then re-installing.
I've enabled development mode in config.php - But still no joy.
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