Create a new extension field in this tile:
Choose Business Context "Product Master General".
Just choose Text as extension field type and length: 20. Once created, it has status "Not Published". In order to allow UI to add this field, you have to publish it.
The publish needs to be done by button "Publish":
The publish is done in an asynchronous way:
Wait until the status has changed to "Published":
After that you can add this extension field to given UI.
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