I have got exactly the same issue.
I am working with VM 2.0.10 on J.2.5.6.
Method 1:
The following occurs:
- I make a new product.
- I choose a title and category
- I press "SAVE"
- I set "Final price", for example 23,95
- I check the box at "Calculate cost price"
- I didn't set the base price / cost price, because I want to calculate it.
- I press "Save" (or "Save & Close" = same result)
Result: All price fields are empty.
I got the notice: "cost Price empty, if child, everything okey, this is just a dev note"
But I don't think this is OK?
Method 2:
- I make a new product.
- I choose a title and category
- I don't press "SAVE"
- I set "Final price", for example 23,95
- I check the box at "Calculate cost price"
- I didn't set the base price / cost price, because I want to calculate it.
- I press "Save"
Result: Cost price is perfectly calculated.
More information:
I've got a standard Tax rule which is:
"BTW per artikel" (something as : Tax per product???) and "+%"
I have tested above several times.
As far as I can see the problem is:
Once a product is saved without a price, the cost price can't been calculated from the final price.
I hope someone comes with a fix, because prices are one of the major features of an e-commerce system.