Stock of Backend Variants is increased instead of reduced when ordering.

[swisschocolate]

Bug Report

Current Behavior
When ordering a product with backend variants and stock handling in variants enabled, the stock gets increased,

Expected behavior/output
Stock has to be reduced.

Environment

• TYPO3 version: 12.4.26
• cart version: 10.0.0
• Is your TYPO3 installation set up with Composer (Composer Mode): no

Possible Solution
Correct sign in Extcode\CartProducts\Domain\DoctrineRepository\Product\BeVariantRepository\addQuantityToStock

->set('stock', $currentStock - $quantity)
should be:
->set('stock', $currentStock + $quantity)