When I try to add a configurable product to a Requisition List, I get the message; it says that I need to choose options for the item, but even if I select one of the options, I get the same message.
I can confirm the issue is with your extension because when I disable your extension, the Requisition List add feature works correctly with the default Magento 2 configurable product option selector.
We have checked the issue you reported and found that our module does not support the feature My Requisition Lists on Magneto 2.3.x EE version.
However, our developer has fixed this issue on our local site.
To have the fixed file, could you please send us an email to firstname.lastname@example.org along with the order number?
We will send you the code fixing the conflict between our module and the Requisition List feature.
If you have any other issues, please don't hesitate to contact us.
We're always happy to support you.