BVC5 SP2
The "Buy One Get One" promotion doesn't work on products that have variations (aka choices). I think this is because the individual variations have unique SKUa that can't be selected for the promotion.
In other words, if you have a product with the SKU of WIDGET, and it has variations of "Small" and "Large", those variations will have SKUs of WIDGETA and WIDGETB respectively. Those WIDGETA and WIDGETB SKUs are
not selectable when setting up the "Buy On Get One" promotion.
Note: Turning inventory off doesn't make any difference.
Steps to Repro:
<OL>
<LI>Create a Widget
<LI>Create 2 product variations for the Widget
<LI>
Go to Marketing / Buy One Get One / New
<LI>
Add the Widget to both the "Products which have to be purchased" and "Products which will be discounted" sections (to cause a discount when 2 are purchased).
<LI>
Go to the store / select the widget / select a product variation / add to cart.
<LI>
Notice that the price is not discounted
</LI></OL>
Note: This behavior also occurs when different products are used in the Products which have to be purchased" and "Products which will be discounted" sections.