What are you sending to the <Macros> trigger? As said before, this trigger is used to supply freemarker macros and has completely unrelated to OpenOffice macros.
If you can create an OpenOffice macro that runs every time the document is opened (I don't know OpenOffice well enough to say if this is possible), then maybe you can your macro format your table,
In any case, the <Macros> trigger won't help with this.
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