Behavior:
By default when a string like value01 value02 value03 is retrieved in the Workflow Engine and assigned to a Keyword field this is entered as independent entries and not as a single string.
For example, if you try to retrieve the Name and Surname from two different fields and put them together in a keyword field it will be entered like this:
Solution:
The idea is to use a text variable using quotes ("'"+GV_text01+"'") as a container for the concatenated values and then assign the full string to the keyword field:
If you wish to store strings containing single quotes to a keyword field, please refer to KBA-36665.