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You can change the commission model, commission rule, fee model, and the status if you have the permissions to do so.
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Activities: When and by whom was the relationship established and changed?
In the single-selection mode click on the 'Activities' - tab next to the Details tab. It will show you all changes that have been made to the relationship since it was established.
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Click on the according field in the info panel and choose the new item.
Afterwards click on ‘save’ at the bottom right of the info panel.
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