Problems with Observable Macro and Observation: Observable is not member type of class 'Models.Observation'

Hey there i try to adept the Observable macro for my SwiftUI Project. I wanna get data from HealthKit and transform it to FHIR. Here i need one class for managing this process which will be shared through my project in order to access these data.

The following Codesnippet raises an error:

import Observation
import HealthKit
import FHIR

@Observable
class HealthKitManager{
    let healthStore = HKHealthStore()
    
    init(){
        
    }
    
    func requestAuthorization(){
        let authTypes: Set = [HKQuantityType(.stepCount),
                              HKQuantityType(.heartRate)
        ]
        
        guard HKHealthStore.isHealthDataAvailable() else {
            print("health data not available!")
            return
        }
        
        healthStore.requestAuthorization(toShare: nil, read: authTypes) {
            success, error in
            if success {
                print("OK Fetching")
            } else {
                print("\(String(describing: error))")
            }
        }   
    }
}

So the FHIR module contains a Models module which define different models. In the FHIR world there is also a concept called observation... now the problems begin.

open class Observation : Models.DomainResource {
    ...
}

When i try import Observation for the Observable macro and also import FHIR in order to create Observations, XCode rises an error: Observable' is not a member type of class 'Models.Observation'

It's also said that Observation is declared in the FHIR.Models.Observation class which is true, but it seems that this raises the Problem with the @Observable macro.

It's also said that Type 'Observation' has no member 'ObservationRegistrar'

Which comes from the Observable Macro i think.

When i don't import FHIR then everything works fine, but then my use case is broken because i need these standard in order to get my use case running.

All in all i need big help and be thankfull for possible solutions!