Set field requirement conditionally

in my form we have two fields to capture the serial number off a specimen. Either a) with the barcode widget or b) manually if the barcode fails. I have currently set the barcode widget first in the work flow and IF the barcode has a value it hides the manual entry.. One problem is that either of these MUST be included in my form as required, However if the barcode fails (for whatever reason- perhaps see above) how can i code my form so that you go from the barcode widget to the manual entry serial number widget. I.e. if the bar code fails as it is required now, it wont let me proceed on the form. I NEED this serial number to be required for sure, but if the bar code fails, i need to be able to enter the serial number with the other widget, However MAKE SURE i have a value in one of the two fields. I don't need both.. How do I configure my widgets to match with workflow please. thanks

This can be achieved using conditional logic.

You can make a Barcode scanner unrequired and then add the conditional logic to the text field for manual entry. You need Enable/Require field condition:

In it, you need to check if the Barcode scanner is filled, and then unrequire the manual entry:

You can also use the Show/Hide field condition to completely hide the field if the widget is filled:

Let us know if this solution works for you.