Measured Quantities prefixes not correct

Summary

The measured quantities list of a device doesn't show the expected prefixes

Steps to reproduce

• Create a device
  • add a new measured quantity

What is the current bug behavior?

The new measured quantity have a prefix resembling its ID, e.g. #4

What is the expected correct behavior?

The new measured quantity should have a prefix of #1 if it is the first of the device. The new measured quantity should have a prefix of #2 if it is the second of the device.

Some logs and/or screenshots

Mentions

@tim.eder @nils.brinckmann

Possible fixes

ToDo's

• Bug reproduced
• Cause found
• Bug fixed