Your screenshot shows a purchasing view, but without any information about plant, also it does not explain or show this "a.(dot)" -phenomena
You missed to enter the plant when you went into this material master view, I bet you would get a message that you have no purchasing data for this plant.
Without a plant specific purchasing view you cannot maintain any depending data like source list.
Extend your material master with MM01 for the plant of your choice.
Go into your material master and check the maintained languages for your material text.
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