diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c8e680..738a234 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- manipulation SetSystemContextActivationStateAndContextAssociation for combined settings
+
 ## [4.1.0] - 2024-02-22
 
 ### Changed
diff --git a/src/t2iapi/combined/combined_requests.proto b/src/t2iapi/combined/combined_requests.proto
index 67929a2..834cad3 100644
--- a/src/t2iapi/combined/combined_requests.proto
+++ b/src/t2iapi/combined/combined_requests.proto
@@ -70,3 +70,14 @@ message SetModeOfOperationAndSetOperatingModeRequest {
                                             // shall be set
     t2iapi.operation.OperatingMode operating_mode = 4; // OperatingMode value to be set for the operation
 }
+
+/*
+Request to set the @ActivationState of the pm:SystemContextState with the specified HANDLE to the requested value and to
+create or adapt a pm:AbstractContextState with the requested @ContextAssociation for the pm:AbstractContextDescriptor with the given HANDLE.
+*/
+message SetSystemContextActivationStateAndContextAssociationRequest {
+    string system_context_handle = 1; // HANDLE of the pm:SystemContextState for which the @ActivationState shall be set
+    t2iapi.activation_state.ComponentActivation system_context_activation = 2; // the requested pm:ComponentActivation value to set for the system context
+    string context_descriptor_handle = 3; // HANDLE of the pm:AbstractContextDescriptor for which one of its pm:AbstractContextStates shall be created or adapted with the given @ContextAssociation
+    t2iapi.context.ContextAssociation context_association = 4; // the @ContextAssociation to be set for the created or adapted pm:AbstractContextState of the requested pm:AbstractContextDescriptor
+}
diff --git a/src/t2iapi/combined/service.proto b/src/t2iapi/combined/service.proto
index cb7c7d7..8b9861d 100644
--- a/src/t2iapi/combined/service.proto
+++ b/src/t2iapi/combined/service.proto
@@ -62,4 +62,15 @@ service CombinedService {
   rpc SetModeOfOperationAndSetOperatingMode (
   t2iapi.combined.SetModeOfOperationAndSetOperatingModeRequest)
       returns (BasicResponse);
+
+  /*
+  Request to set the @ActivationState of the pm:SystemContextState with the specified HANDLE to the requested value and to
+  create or adapt a pm:AbstractContextState with the requested @ContextAssociation for the pm:AbstractContextDescriptor with the given
+  HANDLE.
+  The manipulated states shall be persistent until a next manipulation call or an SDC operation invocation.
+  If the device is not able to maintain the static states, it shall return RESULT_NOT_SUPPORTED.
+  */
+  rpc SetSystemContextActivationStateAndContextAssociation (
+  t2iapi.combined.SetSystemContextActivationStateAndContextAssociationRequest)
+        returns (BasicResponse);
 }