CT3 stock quantity should reduce from customer material quantity

A FG material is 11253 selling to UK customer through customer material number as 11253UK and same material is exporting to Canada as 11253CA

In Deemed export scenario, CT3 forms are comes into picture where, license will maintain interms of 11253UK and 11253CA as per customs license.

once the invoice is done, stock should be reduced from material code 11253, since this is the parent material.

currently we are facing problem in stock is reducing from the customer material number since this code has maintained in license

the business wants to reduce the stock after sales from actual code

please help me to find solution on this issue

Regards,

Pratheep