C_CPI Integration Suite Development Practice Question
An integration developer uses a Message Mapping with a user-defined function in SAP Cloud Integration. The mapping must concatenate a constant prefix to a source field value, but the output is empty even though the source field is populated. The function uses the following Groovy code: return prefix + input; where prefix is a String parameter and input is the mapped source field. What is the most likely cause?
⚠ Common exam trap
The trap here is assuming the empty output is caused by an unsupported scripting language or a missing resource, when parameter typing and input binding are the usual culprits.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The prefix parameter was declared with the wrong type or the input field is not bound, so the concatenation evaluates to an empty string.
In Message Mapping user-defined functions, parameters must have compatible types and the source field must be bound to the function input. If the prefix parameter type is wrong or the input binding is missing, the Groovy concatenation evaluates with an empty operand and returns an empty string. Verifying the function signature and binding the source field corrects the output.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Groovy is not supported in user-defined functions, so the script silently returns null and the mapping outputs an empty element.
Why it's wrong here
Groovy is a supported scripting language for user-defined functions in SAP Cloud Integration Message Mapping, so the language choice is not the problem. If Groovy were unsupported, the mapping would fail with an error rather than produce an empty element. The empty output is more consistent with a parameter or binding issue.
- ✓
The prefix parameter was declared with the wrong type or the input field is not bound, so the concatenation evaluates to an empty string.
Why this is correct
In SAP Cloud Integration Message Mapping, user-defined function parameters must be declared with compatible types and the input must be bound to a source field. If the prefix parameter type is incompatible or the input binding is missing, the concatenation yields an empty result. Correcting the parameter type and binding the source field resolves the empty output.
- ✗
The user-defined function is not registered in the Integration Flow's Resources, so it cannot access the prefix parameter.
Why it's wrong here
User-defined functions in Message Mapping are defined within the mapping itself, not registered as separate flow resources. The prefix parameter is passed through the function signature, so registration is not the issue. The empty output points to how the parameter is declared or how the input is typed, not to a missing resource.
- ✗
The source field is populated in the payload but the mapping uses a namespace prefix that does not match the source schema, causing the field to resolve to null.
Why it's wrong here
A namespace mismatch would typically cause the source field to be unresolved, but the scenario states the source field is populated and the function is invoked. The issue is inside the function's parameter handling, not the source schema namespace. While namespace errors are common, they do not explain a populated field producing empty output through a concatenation.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official SAP exam blueprint
This C_CPI practice question is part of Courseiva's free SAP certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the C_CPI exam.