fix: enforce consistency of contract negotiation request and transfer… #512

Job	Run time
Checkstyle	4m 25s
Component-Tests	13m 35s
API-Tests	11m 3s
End-To-End-Tests	16m 10s
Javadoc	6m 15s
Postgresql-Integration-Tests	10m 17s
Unit-Tests	5m 24s
Upload-Test-Report	9s
Upload-Coverage-Report-To-Codecov	6s
	1h 7m 24s

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