An item with the same key has already been added

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Can you provide more details about the column that you are trying to modify?

One of the system columns. like "Instance Number"

You said you're trying to change the language. What does that mean? Are you trying to change the name of the column like in the attached picture?

Yes the report breaks whenever I try to change the language of systems column. "Instance Number" for example

OK. I don't know why this is happening so I'm just sharing my thoughts... Do you use any special characters? Are you trying to name the column as one that already exists on the report? Can you try renaming the column in Designer Studio? If you're already working in DS, can you try on the portal directly? If nothing helps, can you create a report from scratch and see if this resolves your issue?

Please find my comments below:

Do you use any special characters? No special character. Just trying to rename the system columns.
Are you trying to name the column as one that already exists on the report? No, different name.
Can you try renaming the column in Designer Studio? tried and report crashes there too.
If you're already working in DS, can you try on the portal directly? Report crashes in portal too.
If nothing helps, can you create a report from scratch and see if this resolves your issue? Tried already and report crashed. Doesn't crash when I add a header instead of changing the language of the column,

Now I'm lost. Sorry, but I really don't understand. You said that it doesn't crash when you "add a header" but it crashes when "changing the language of the column". Where are you trying to change the language of the column? Can you provide more screenshots? The one you initially provided doesn't tell anything.

Witch version of BPS You tring to do it?