Hello Weronika,
welcome in the SAP Community and here in the forum.
Please take a look at SAP note 829096 - Invalid GUI input data, here are some reasons why it couldn't work.
Could it be possible that the one SAP user uses other Office configurations? So it could be possible that it enter invalid double-byte characters via VBA. You can find a detailed description in SAP note 1763206 - Focus: "Invalid GUI Input data" with Unicode text input.
What SAP GUI for Windows and Microsoft Office do you use?
Cheers
Stefan
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