diff --git a/internal/dataagreement/dataagreements.go b/internal/dataagreement/dataagreements.go
index 448f766..5d2039d 100644
--- a/internal/dataagreement/dataagreements.go
+++ b/internal/dataagreement/dataagreements.go
@@ -352,3 +352,33 @@ func (darepo *DataAgreementRepository) GetDataAgreementsByLifecycle(lifecycle st
 	}
 	return results, nil
 }
+
+func (darepo *DataAgreementRepository) CountDocumentsByPurpose(purpose string) (int64, error) {
+
+	filter := common.CombineFilters(darepo.DefaultFilter, bson.M{"purpose": purpose})
+
+	exists, err := Collection().CountDocuments(context.TODO(), filter)
+	if err != nil {
+		return exists, err
+	}
+	return exists, nil
+}
+
+func (darepo *DataAgreementRepository) CountDocumentsByPurposeExeptOneDataAgreement(purpose string, dataAgreementID string) (int64, error) {
+
+	dataAgreementId, err := primitive.ObjectIDFromHex(dataAgreementID)
+	if err != nil {
+		return 0, err
+	}
+
+	filter := common.CombineFilters(darepo.DefaultFilter, bson.M{
+		"purpose": purpose,
+		"_id":     bson.M{"$ne": dataAgreementId},
+	})
+
+	exists, err := Collection().CountDocuments(context.TODO(), filter)
+	if err != nil {
+		return exists, err
+	}
+	return exists, nil
+}
diff --git a/internal/handler/v2/config/dataagreement/config_create_dataagreement.go b/internal/handler/v2/config/dataagreement/config_create_dataagreement.go
index d2a5bf5..81f52f4 100644
--- a/internal/handler/v2/config/dataagreement/config_create_dataagreement.go
+++ b/internal/handler/v2/config/dataagreement/config_create_dataagreement.go
@@ -270,6 +270,21 @@ func ConfigCreateDataAgreement(w http.ResponseWriter, r *http.Request) {
 		common.HandleErrorV2(w, http.StatusNotFound, m, err)
 		return
 	}
+	// Repository
+	darepo := dataagreement.DataAgreementRepository{}
+	darepo.Init(organisationId)
+
+	count, err := darepo.CountDocumentsByPurpose(dataAgreementReq.DataAgreement.Purpose)
+	if err != nil {
+		m := "Failed to count data agreement by purpose"
+		common.HandleErrorV2(w, http.StatusNotFound, m, err)
+		return
+	}
+	if count >= 1 {
+		m := "Data agreement purpose exists"
+		common.HandleErrorV2(w, http.StatusBadRequest, m, err)
+		return
+	}
 
 	// Initialise data agreement
 	var newDataAgreement dataagreement.DataAgreement
@@ -309,10 +324,6 @@ func ConfigCreateDataAgreement(w http.ResponseWriter, r *http.Request) {
 
 	}
 
-	// Repository
-	darepo := dataagreement.DataAgreementRepository{}
-	darepo.Init(organisationId)
-
 	// Save the data agreement to db
 	savedDataAgreement, err := darepo.Add(newDataAgreement)
 	if err != nil {
diff --git a/internal/handler/v2/config/dataagreement/config_update_dataagreement.go b/internal/handler/v2/config/dataagreement/config_update_dataagreement.go
index 2a9a941..2c571f3 100644
--- a/internal/handler/v2/config/dataagreement/config_update_dataagreement.go
+++ b/internal/handler/v2/config/dataagreement/config_update_dataagreement.go
@@ -167,6 +167,20 @@ func ConfigUpdateDataAgreement(w http.ResponseWriter, r *http.Request) {
 	daRepo := dataagreement.DataAgreementRepository{}
 	daRepo.Init(organisationId)
 
+	count, err := daRepo.CountDocumentsByPurposeExeptOneDataAgreement(dataAgreementReq.DataAgreement.Purpose, dataAgreementId)
+	if err != nil {
+		m := "Failed to count data agreements by purpose"
+		common.HandleErrorV2(w, http.StatusNotFound, m, err)
+		return
+	}
+	if count >= 1 {
+		m := "Data agreement purpose exists"
+		common.HandleErrorV2(w, http.StatusBadRequest, m, err)
+		return
+	}
+
+	daRepo.Init(organisationId)
+
 	// Get data agreement from db
 	currentDataAgreement, err := daRepo.Get(dataAgreementId)
 	if err != nil {