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The easiest way to assign a keyword is via the icon at the top of the toolbar.
A keyword is a string of characters not interrupted by spaces.
If you enter "Summer offer", you have created or assigned two keywords!
Use underscores or hyphens to create unique terms such as "Summer_offer".
Add the Keywordsicon to your toolbar :
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Keyword management can be found in the master data under Organization > Master data > Keywords: Manage keywords. Click here for the article with the same title"Manage keywords".