diff --git a/src/modules/connection-test/connection-test.service.ts b/src/modules/connection-test/connection-test.service.ts
index fe4930d..76af8a5 100644
--- a/src/modules/connection-test/connection-test.service.ts
+++ b/src/modules/connection-test/connection-test.service.ts
@@ -187,6 +187,20 @@ export class ConnectionTestService {
     body: GetTableMetadataReq,
     user: RequestUser,
   ): Promise<GetTableMetadataRes> {
+    // Columns eligible as the incremental reference field are the ones whose
+    // data type is allowed for this engine (e.g. int/date/timestamp). The
+    // allowlist is owned by the platform API, keyed by engine === plugin.
+    const allowedByEngine = await this.platformApiService
+      .proxy('GET', '/jobs/jdbc/configs/allowed_datatypes', user)
+      .catch(() => null);
+    const allowedDataTypes: string[] =
+      allowedByEngine?.allowed_datatypes?.find(
+        (datatypes) => datatypes.engine === body.plugin,
+      )?.allowed_datatypes ?? [];
+    const allowedSet = new Set(
+      allowedDataTypes.map((type) => type.toLowerCase()),
+    );
+
     const tables_metadata = await Promise.all(
       body.table_list.map(async (table_name) => {
         const result = await this.connectionsApiService.proxy(
@@ -196,14 +210,18 @@ export class ConnectionTestService {
             `/tables/${encodeURIComponent(table_name)}/columns`,
           user,
         );
+        const columns = result.columns.map((column) => ({
+          name: column.column_name,
+          type: column.data_type,
+          is_primary_key: column.is_primary_key,
+        }));
+        const references = columns.filter((column) =>
+          allowedSet.has(String(column.type).toLowerCase()),
+        );
         return {
           table_name,
-          columns: result.columns.map((column) => ({
-            name: column.column_name,
-            type: column.data_type,
-            is_primary_key: column.is_primary_key,
-          })),
-          references: [],
+          columns,
+          references,
         };
       }),
     );