ConfigurationApp: OAI wrong generation of rest request.

Steps to reproduce:

• Select config app and select first entry
• A pop up is indicating a problem (PROBLEM1)
• Add to URL /_3gpp-common-managed-element:ManagedElement[ManagedElement=gNB-Eurecom-5GNRBox-00001]
• and press enter and see new configuration subpage
• navigate to last entry _3gpp-nrm-gnbdufunction and click "GNBDUFUNCTION"
• New window opens with one id "ManagedElement=gNB-Eurecom-5GNRBox-00001,GNBDUFunction=0"
• New window opens with further Id "ManagedElement=gNB-Eurecom-5GNRBox-00001,GNBDUFunction=0"
• Error output (PROBLEM2) .. see screenschot