Serial Number issue

Hello,

I have never worked in the module QM before. Today a client had an issue (post-upgrade) about the serial number not being displayed in stock movement.

More details:

Transaction QA32, I put my material number and execute

I select the required line and click Usage Decision

Previously, the stock location was MMMK.

I now change it to MMAT and put 1 in the field to be posted (to unrestricted use)

I put A0 for the UD code and save.

Now I check the stock overview in the transaction MMBE:

Select the line MMAT and choose Material Movements

I double-click on the required line to display the material document

The problem is here. In the tab Serial Numbers, the Serial Number is empty.

In the previous system (before upgrade), it was like that:

I'm having trouble to find where is the link between the Serial Number and Stock Movement.

I hope I am clear enough for some of you to understand. Don't hesitate to ask questions if you have.

Grateful if someone could shed some light on this issue so that I know towards what direction I should continue my analysis.

Thank you