'how to conditionnally lock cells on google sheet
i tried for many days to find a solution for my problem without any results
my issue is that i want to lock a cell as soon as it's filled with data(the data is a drop-down menu that the client choose from it to fill the cell) this cell i want it to be a prove of payment(from the client)that the client received his payment, so it can't be modified after he made his answer on it i tried many things that i found while searching but none is working as i want it to be or it's a formatting conditions that depends on colors thank you
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