I have a new function file in which I had to remove some parameters because they didn't belong to that function. When I try to activate this file it fails with below message:

This message just shows in which Service Definitions the function is used, but doesn't mention the reason why it fails.

Also the Function Manager log file doesn't mention anything:

Logfile "SLFunctionManager" from agent "10.10.18.100"...

2021/10/01 14:49:51.865|SLLog|ApplyLogLevels|CRU|-1|Log Levels: Info: 1; Error: 1; Debug: 1 (from LogSettings.xml)
2021/10/01 14:53:27.277|SLNet.exe|Initialize|CRU|0|76|Initializing BaseFunctionManager...
2021/10/01 14:53:27.353|SLNet.exe|Initialize|CRU|0|76|Initialized BaseFunctionManager.
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I had to use the client test tool and follow my Cube session to see the TraceData > ErrorData in SetCurrentFunctionsXmlResponseMessage. It mentions 3 error reasons: SetCurrentBlockedModifications, ProtocolFunctionInUseByServiceDefinitions and ProtocolFunctionInUseByResources.

Question 1: What exactly is blocking the activation of the functions file? Is it because parameters are no longer available? Is it because it's used in several Service Definitions? ...

Question 2: How can I force activate the new functions file? I don't want to deactivate it since that will result in losing all my resources with manually added capacities, capabilities and properties.