minor adjustment to fix relational values frontend #3727

Job	Run time
Integration Tests (Java 11) (mongodb)	1h 36m 32s
Integration Tests (Java 11) (hsqldb)	1h 36m 23s
Integration Tests (Java 11) (monetdb)	1h 37m 3s
Integration Tests (Java 11) (postgresql)	37m 11s
Integration Tests (Java 11) (file)	1h 37m 11s
Integration Tests (Java 11) (cottontail)	37m 9s
Integration Tests (Java 11) (neo4j)	1h 36m 59s
	9h 18m 28s

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