So, for the first thing, am I correct you entered just: products_id in the User defined fields entry of the configuration->Easy Populate 4. Not v_products_id. The code will export a products field that is provided in that user defined fields entry.

So something is wrong with that setup (not the program)
That's correct, my entry was products_id on that field, nothing else was touched.

3. So, you do not have any products that have a model number that starts with 001- correct?
Not correct. All the items started by 001- (I really don't understand why he did that, but I'm sure if there's any other way for him to create models it will be ok, since he's only using them to use EP, nothing else.