Gateway timeout error while importing the LMS.
NOTE: Some knowledge on why you are getting this error.
When you are loading huge amount of data to process web server needs more time to process, so by the time proxy/apache server does not receive the response it will respond with timeout error.
Few customers have huge set of data so obviously it is expected to get the timed out exception. This is the reason when you tried to import the same labels on different environment where you have less existing labels it worked without any issues.
Labels import logic checks for the every label is already available or not and depending on that it will do necessary updates/inserts into the table.
SAP SuccessFactors Learning - All Supported Versions
Gateway timeout , label import , KBA , LOD-SF-LMS-PER , Application Latency/ Performance Issues , Problem
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