diff --git a/@xen-orchestra/cr-seed-cli/index.js b/@xen-orchestra/cr-seed-cli/index.js
index ec8e90cd0..10a346bf1 100755
--- a/@xen-orchestra/cr-seed-cli/index.js
+++ b/@xen-orchestra/cr-seed-cli/index.js
@@ -83,19 +83,17 @@ ${cliName} v${pkg.version}
 
   await Promise.all([
     srcSnapshot.update_other_config(metadata),
-    srcSnapshot.update_other_config({
-      'xo:backup:exported': 'true',
-    }),
+    srcSnapshot.update_other_config('xo:backup:exported', 'true'),
     tgtVm.set_name_label(`${srcVm.name_label} (${srcSnapshot.snapshot_time})`),
     tgtVm.update_other_config(metadata),
     tgtVm.update_other_config({
       'xo:backup:sr': tgtSr.uuid,
       'xo:copy_of': srcSnapshotUuid,
     }),
-    tgtVm.update_blocked_operations({
-      start:
-        'Start operation for this vm is blocked, clone it if you want to use it.',
-    }),
+    tgtVm.update_blocked_operations(
+      'start',
+      'Start operation for this vm is blocked, clone it if you want to use it.'
+    ),
     Promise.all(
       userDevices.map(userDevice => {
         const srcDisk = srcDisks[userDevice]
diff --git a/packages/xen-api/src/index.js b/packages/xen-api/src/index.js
index a9fccbd90..8284ea2c1 100644
--- a/packages/xen-api/src/index.js
+++ b/packages/xen-api/src/index.js
@@ -1102,8 +1102,10 @@ export class Xapi extends EventEmitter {
             })
             return result
           }
-          props[`update_${field}`] = function(entries) {
-            return xapi.setFieldEntries(this.$type, this.$ref, field, entries)
+          props[`update_${field}`] = function(entries, value) {
+            return typeof entries === 'string'
+              ? xapi.setFieldEntry(this.$type, this.$ref, field, entries, value)
+              : xapi.setFieldEntries(this.$type, this.$ref, field, entries)
           }
         } else if (value === '' || isOpaqueRef(value)) {
           // 2019-02-07 - JFT: even if `value` should not be an empty string for