'AuftragsStorno' is obsolete: 'This is not used in the implementation of the blocking process - we use the enum Auftragsstornogrund instead'

'SperrauftragsStorno' is obsolete: 'This is not used in the implementation of the blocking process - we use the enum Auftragsstornogrund instead'

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

'JsonSerializerOptions.IgnoreNullValues' is obsolete: 'JsonSerializerOptions.IgnoreNullValues is obsolete. To ignore null values when serializing, set DefaultIgnoreCondition to JsonIgnoreCondition.WhenWritingNull.' (https://aka.ms/dotnet-warnings/SYSLIB0020)

Dereference of a possibly null reference.

Dereference of a possibly null reference.