The answer is a Catalog Client Script of type 'onSubmit' that sets the variable mandatory using the `g_form.setMandatory()` method. This is correct because an onSubmit script executes after the user clicks Submit but before the record is saved, allowing it to dynamically override the variable's definition in the catalog item. Even if the variable is not marked mandatory in the item's variable definitions, the script can enforce it at runtime, triggering the 'mandatory but has no value' error when the field is left empty. On the ServiceNow CSA exam, this tests your understanding of client-side scripting versus declarative configuration—a common trap is assuming mandatory settings only come from the variable definition itself. Remember that onSubmit scripts run last in the client-side lifecycle, so they can override earlier settings. Memory tip: "Submit scripts set secrets" — meaning onSubmit can silently enforce mandatory rules that aren't visible in the variable definitions.
SNOW-CSA Service Catalog and Workflows Practice Question
This SNOW-CSA practice question tests your understanding of service catalog and workflows. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A user complains that when they submit a catalog item, they receive an error: 'The variable is mandatory but has no value.' However, the variable is not marked as mandatory in the item's variable definition. What could be the cause?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A Catalog Client Script of type 'onSubmit' sets the variable mandatory.
Option A is correct because a Catalog Client Script of type 'onSubmit' can dynamically set a variable as mandatory using the `g_form.setMandatory('variable_name', true)` method. This overrides the variable's definition in the catalog item, causing the 'mandatory but has no value' error even when the variable is not marked mandatory in the item's variable definition.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A Catalog Client Script of type 'onSubmit' sets the variable mandatory.
Why this is correct
Client scripts can enforce mandatory before submission.
Related concept
Read the scenario before looking for a memorised answer.
✗
A Business Rule on the request table sets the variable mandatory.
Why it's wrong here
Business Rules run server-side after submission, not before.
✗
A UI Policy on the record producer makes the variable mandatory.
Why it's wrong here
UI Policies are for forms, not catalog variables.
✗
The variable is mandatory in the parent catalog category.
Why it's wrong here
Mandatory is defined per item, not inherited.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume mandatory status is only set in the variable definition or via UI Policies, overlooking that Catalog Client Scripts of type 'onSubmit' can dynamically enforce mandatory validation at submission time.
Detailed technical explanation
How to think about this question
Catalog Client Scripts of type 'onSubmit' execute client-side before the form is submitted to the server. The `g_form.setMandatory()` method dynamically adds the 'mandatory' attribute to a variable, which is then enforced by the client-side validation logic. If the variable is left empty, the system throws the 'mandatory but has no value' error, bypassing the static variable definition. This is a common pattern for conditional mandatory fields, such as requiring a 'reason' field only when a 'change type' is selected.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the SNOW-CSA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Service Catalog and Workflows — This question tests Service Catalog and Workflows — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A Catalog Client Script of type 'onSubmit' sets the variable mandatory. — Option A is correct because a Catalog Client Script of type 'onSubmit' can dynamically set a variable as mandatory using the `g_form.setMandatory('variable_name', true)` method. This overrides the variable's definition in the catalog item, causing the 'mandatory but has no value' error even when the variable is not marked mandatory in the item's variable definition.
What should I do if I get this SNOW-CSA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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