diff -r 7977c1bdba1f -r c9fece435aa2 src/GuileHandler.h
--- a/src/GuileHandler.h	Tue Feb 05 00:06:44 2019 +0100
+++ b/src/GuileHandler.h	Tue Feb 05 12:14:58 2019 +0100
@@ -190,6 +190,8 @@
 			for (DefinitionRecipe definition : currentRelationConfiguration->definitions) undefineGuileVariable(definition.name);
 		}
 		for (auto attribute : currentReaderMetadata) undefineGuileVariable(attribute.getAttributeName());
+		
+		for (DefinitionRecipe definition : configuration.definitions) defineGuileVariable(definition);
 
 		currentRelationConfiguration = nullptr;
 		for (int i = 0; i < configuration.relationConfigurations.size(); i++) {