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When Allied WarEntry is 100% they will always declare war on whatever country uses the GER tag. The only way to avoid it is not use that tag or keep the Allies from having 100% WE (assuming they are Democracies).
I think you can specify a negative warentry in the scenario file but there was some discussion in the bug forum whether negative warentry should be allowed so this may change in future patches. Might be better to use events every year or so to drop warentry.