It is not possible to remove job node return code dependencies

Affected version is 1.9RC1
Description

• Open a job chain
• create a job chain node return code definition by clicking return codes
• save the job chain
• open the job chain again and try to remove the entries in the tables
• save the job chain
• open the job chain again. The entries are still there

Desired behavour

• Open a job chain
• create a job chain node return code definition by clicking return codes
• save the job chain
• open the job chain again and try to remove the entries in the tables
• save the job chain
• open the job chain again. The entries are removed