Products can be Added to Cart exceeding existing product_in_stock

[uthpala]

When shopper adds item into cart and once finished payments, I update the 'product_in_stock' variable ,by deducting the amount the shopper bought. I didn't use product_ordered variable here. This is  done inside the function plgVmOnPaymentResponseReceived(), in my payment plugin . Is this ok or wrong?

And for a partcular product item if the amount is only 1, & one shopper adds it into cart & until he does the payment, that product item can be ordered(added to cart) by someone else, which leads to over selling.
How can i find a solution for this problem

[uthpala]

Hi, I am using , Joomla 1.5 + Virtuemart 2.0.20
this is the status for a particular product

product_in_stock =5
product_ordered = 5


Then when I tested, to Add that product to my cart I can add any amount of this product. Why this issue?
Any help pls

[Maxim Pishnyak]

Your versions are outdated.

[Maxim Pishnyak]

ordered(added to cart) by someone else, which leads to over selling.

In your case ordered=sold?