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src/store/articleproperty/setByArticleSku.js

@@ -27,7 +27,8 @@ export default function setByArticleSku(provider) {
 
   /**
    * Replaces all properties for an article by its SKU.
-   * Enforces exclusive flag on property names.
+   * Enforces exclusive flag on property names. An exclusive property that already has a value
+   * is never overwritten: a different value throws `Exclusive property cannot be overwritten: <name>`.
    *
    * @param {number} googleAuthId - The id of the Google auth user.
    * @param {string} sku - The article SKU.
@@ -79,6 +80,12 @@ export default function setByArticleSku(provider) {
         }
 
         const value = item.value != null ? String(item.value).trim() : '';
+        if (isExclusive) {
+          const existing = oldProps.find((p) => p.propertyId === propertyId);
+          if (existing && existing.value !== '' && existing.value !== value) {
+            throw new Error(`Exclusive property cannot be overwritten: ${prop.name}`);
+          }
+        }
         const sort = item.sort != null && Number.isInteger(item.sort) ? item.sort : i;
         validated.push({
           propertyId,

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,