diff --git a/stackit/internal/services/postgresflexalpha/database/datasource.go b/stackit/internal/services/postgresflexalpha/database/datasource.go
index d6890954..45bd305c 100644
--- a/stackit/internal/services/postgresflexalpha/database/datasource.go
+++ b/stackit/internal/services/postgresflexalpha/database/datasource.go
@@ -166,7 +166,16 @@ func handleReadError(ctx context.Context, diags *diag.Diagnostics, err error, pr
 			projectId,
 		),
 		map[int]string{
-			http.StatusNotFound:  fmt.Sprintf("Database, instance %q, or project %q not found.", instanceId, projectId),
+			http.StatusBadRequest: fmt.Sprintf(
+				"Invalid request parameters for project %q and instance %q.",
+				projectId,
+				instanceId,
+			),
+			http.StatusNotFound: fmt.Sprintf(
+				"Database, instance %q, or project %q not found.",
+				instanceId,
+				projectId,
+			),
 			http.StatusForbidden: fmt.Sprintf("Forbidden access to project %q.", projectId),
 		},
 	)