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Created attachment 804398 [details] server.log Description of problem: Clicking Validate button in rule template editor has no UI response. Exception is printed into server log: "Caused by: ... GenericPortableException: : Content is not allowed in prolog." Version-Release number of selected component (if applicable): ER3 How reproducible: - Steps to Reproduce: 1. create new GRT 2. click Validate Actual results: No validation result in UI. Exception in server log. Expected results: Validation should be successful, no exception. Additional info: The issue is not restricted to empty rule templates. Adding a fact pattern and template data rows to generate some rules doesn't help.