Problem: I would like to connect a Types custom field image to a Beaver Themer Photo Module.
Solution: With Views active, you can use a Types field in the Photo Source input area. Without Views active, Beaver Builder does not render shortcodes here so it's not currently possible.
Why i can't add custom toolset field with this exist “field slug”?
Solution:
I assume you have already create a custom field with slug "_wc_wholesale_price", if you need put it in another field group, please edit the field group, click the button "Add New Field", in the following dialog window, click button "Choose from previously created fields", find and click the field "_wc_wholesale_price", and test again.