Please be informed that there is a bug in the Branding and Advertising tutorial which prevents the player from linking the Advertising and the Sales unit.
The bug is due to the following text block:
[TEXT]
Now link your ~Advertising~ unit and your ~Sales~ unit by ~clicking the linkage line~ between them.
[POS]
Text Box=430,150,350,0
Pointer=641,342,646,357
[CONDITION]
Unit Linked=Sales, Advertising, 3, 5
In your translated version of this tutorial, please change the line "Unit Linked=Sales, Advertising, 3, 5" to "Unit Linked=Sales, Advertising, 2, 5" and it will fix the problem.
Thanks!