Change base rate after having created a rate
Once you have created a rate, you should be able to amend it and link it to a base rate. If you have already mapped it on your channel manager, you do not wish to delete it and restart, you just want to now link it to a base rate or change the base rate link

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Jasmin H. commented
It takes an unbelievable amount of time to make all the settings again, including translations, allocations, etc.
It has to be done faster! -
Simone Steins commented
at the moment you are not able to change the base rate once a rate is created. this is really annoying as you may want to reclassify the rate and it could be linked to your channel manager.
now, you need to make a brand new rate and amend all your settings everywhere. if you were able to change the base rate, it would be a 2 second job, now it is more like 20 minutes or longer