If Then Else statement using decimals

Hello!

I want to use a different ComboBox depending on the value the user introduces, the problem is that if the user introduces a value with a point in it (1.1), it takes it as 11. If I use commas it is fine but I want the user to be able to introduce either points or commas

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Thank you!

You've shown only the code no file, so it's not so obvious, but I'd assume SI is a textbox, so it contains a text (string). VBA tries to convert it to double when you compare it to double, but from your description it sounds that it fails due to whong treatment of non-standard decimals separator.
Let's try:

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