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-rw-r--r--interface-definitions/cron.xml3
1 files changed, 3 insertions, 0 deletions
diff --git a/interface-definitions/cron.xml b/interface-definitions/cron.xml
index a9e9b0401..8e4c1294a 100644
--- a/interface-definitions/cron.xml
+++ b/interface-definitions/cron.xml
@@ -44,6 +44,9 @@
<format>&lt;days&gt;d</format>
<description>Execution interval in days</description>
</valueHelp>
+ <constraint>
+ <regex>[1-9]([0-9]+)([mhd]{0,1})</regex>
+ </constraint>
</properties>
</leafNode>
<node name="executable">