diff --git a/srv/TSTExecutorGetConstraints.srv b/srv/TSTExecutorGetConstraints.srv
index 841233ab25b256a0fd8ab6d7b51e326c809808d5..f00d8a6abd982af6458ce969c480b9731f320d30 100644
--- a/srv/TSTExecutorGetConstraints.srv
+++ b/srv/TSTExecutorGetConstraints.srv
@@ -9,8 +9,7 @@
 string ns       # Namespace for the tstfactory
 int32 id        # id for the TST node in the tstfactory
 ---
-string[] variables
-string[] constraints
+string csp_json
 bool success
 int32 error
 string reason
diff --git a/srv/TSTExecutorGetConstraintsFromTni.srv b/srv/TSTExecutorGetConstraintsFromTni.srv
index ca09c4643432ebf19b11de0c6deee209f0f83369..08c7d5457417abe82f48f75fd5bea4eb4ce73dac 100644
--- a/srv/TSTExecutorGetConstraintsFromTni.srv
+++ b/srv/TSTExecutorGetConstraintsFromTni.srv
@@ -8,8 +8,7 @@
 
 lrs_msgs_tst/TSTNodeInfo tni
 ---
-string[] variables
-string[] constraints
+string csp_json
 bool success
 int32 error
 string reason