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It is allowed to add the same netbeans module project on its classpath. Please check it in modules list in libraries tab.
Fixing summary - I hope this is what you meant, if not please clarify. ("modul smi byt pridan do svych vlastnich dependencu"?)
Fixed. Checking in ui/customizer/SingleModuleProperties.java; 1.31 --> 1.32
SingleModuleProperties.java 1.20