it is great to add a control field to my form, this way only my current customer would be able to submit a form which should be linked to an excel sheet containing all customer numbers
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@user1852 that’s a very smart idea, thanks a lot for sharing!
I cannot promise that we’ll be able to develop such a feature soon, but we’ll try our best to consider it for our future updates 
Thank you very much for your help and welcome to the Elfsight community!