Total stock quantities incorrect in back office for articles with sizes and colours

[Bert]

Dear all,

One of our clients uses our stock management program to send quantities to PrestaShop, for "regular" articles but also for articles with sizes and colors. The quantities sent to PrestaShop are correct and the individual quantity of one size-color combination is also correctly shown.

However, in the PrestaShop back office, the total quantities of a size and color article are incorrect.

Any idea how to solve this?

Kind and best regards,

Bert