diff --git a/Service Portal/validate-data-field/readme.md b/Service Portal/validate-data-field/readme.md
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+# Validating a data field in a Service Portal
+
+Use Case: When submitting a Record Producer, a date field can’t be in the past. How to accomplish this?
+
+We can create a Catalog Client Script.
+
+1) What is the trigger?
+
+The script will run when the date field value changed.
+
+2) What do we need to confirm?
+
+We need to check if the date provided is in the future.
+
+3) What if the date is not in the future?
+
+If the date is not in the future, then we show an error message to inform that the date cannot be in the past.
+
+Step by step process
+
+1) Create a Record Producer (RP) and define the Catalog and Category so it will be visible in a Service Portal
+
+2) Create a variable in your RP. In this example, the variable will have this configuration:
+
+Type: Date
+Question: Project Deadline
+Name: project_deadline
+Mandatory: Yes (checked)
+
+3) Create a Catalog Client Script in your RP to check if the project_deadline value changed. If the date is in the past, show an error message to the user.
+
+Your Catalog Client Script will look like this:
+
+Name: Validate Project Deadline
+Applies to: A Catalog Item
+UI Type: Mobile / Service Portal
+Type: onChange
+Variable name: project_deadline
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diff --git a/Service Portal/validate-data-field/script.js b/Service Portal/validate-data-field/script.js
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+//Catalog Client Script
+function onChange(control, oldValue, newValue, isLoading) {
+
+    if (isLoading || newValue == '') {
+        g_form.hideFieldMsg('project_deadline', true);
+        return;
+    }
+
+    //If the Project Deadline is in the past, show error message
+    var deadlineDate = new Date(getDateFromFormat(newValue, g_user_date_format));
+    var nowDate = new Date();
+
+    if (nowDate.getTime() >= deadlineDate.getTime()) {
+
+        g_form.setValue('project_deadline', '');
+        g_form.showErrorBox('project_deadline', 'Project deadline should be after today', true);
+
+    } else {
+
+        g_form.hideFieldMsg('project_deadline', true);
+
+    }
+
+}
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