Hi @Martini0 ,
When you create a list, the list will automatically generate a Title column. Please see the picture below:

The value of this column is required.
So, you could try this formula:
Patch(MARAM; {Title:"Test",Item: BarcodeScanner1.Value; WhoScanned:User().FullName; Time: Now()})
But I suggest you write like this:
Patch(MARAM;Defaults(MARAM);{Title:"Test";Item: BarcodeScanner1.Value; WhoScanned:User().FullName; Time: Now()})
Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.