diff --git a/common/src/grpc_error.rs b/common/src/grpc_error.rs
index 9a67d9e..f1ffc7a 100644
--- a/common/src/grpc_error.rs
+++ b/common/src/grpc_error.rs
@@ -1,2 +1,5 @@
 pub const ERROR_REASON_METADATA_KEY: &str = "komp-ac-error-reason";
+pub const EXPECTED_ROW_METADATA_KEY: &str = "komp-ac-expected-row-bin";
 pub const COMPUTED_VALUE_MISMATCH_REASON: &str = "computed-value-mismatch";
+pub const ROW_STALE_REASON: &str = "row-stale";
+pub const ROW_ID_CONFLICT_REASON: &str = "row-id-conflict";