When there are errors in the log, you need to show us the ENTIRE log (not just the errors) for this data step.
It would seem from the error message you have provided that the variable HVORDAN_SYNES_DU_DIT_HELBR is numeric and therefore you cannot test to see if it is equal to a character string such as "Fremragende". Thus it would also help if you showed us a portion of the data in data set SF36, as working SAS data step code, which you can see examples and instructions here.
Typically, we do not want the errors in the log to be used as the subject line. We would want a verbal description of the problem, such as "Trying to assign categories".
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Paige Miller