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src/store/propertyname/update.js

@@ -47,6 +47,16 @@ export default function update(provider) {
     const sort = input.sort !== undefined && Number.isInteger(input.sort) ? input.sort : existing.rows[0].sort;
     const exclusive = input.exclusive !== undefined ? (Boolean(input.exclusive) ? 1 : 0) : existing.rows[0].exclusive;
 
+    if (exclusive && !existing.rows[0].exclusive) {
+      const multi = await runner.query(
+        `SELECT article_id FROM articleproperty WHERE property_id = @id GROUP BY article_id HAVING COUNT(*) > 1`,
+        { id },
+      );
+      if (multi.rows.length > 0) {
+        throw new Error(`Cannot set property exclusive: ${multi.rows.length} article(s) have multiple values`);
+      }
+    }
+
     await runner.query(updateSql, {
       id,
       companyId,