C_CPI Integration Suite Development Practice Question
An integration developer is configuring a Message Mapping step in an integration flow. The target structure must include a subtotal element that sums the Price values of all Item nodes from the source, and the mapping also contains a user-defined function that performs this summation. After deployment, the receiver reports that the subtotal is always 0. The developer confirms the source payload contains multiple Item nodes with valid numeric Price values. What is the most likely cause?
⚠ Common exam trap
The trap here is assuming that any user-defined function automatically aggregates across all occurrences of a source node, when it actually runs per context unless explicitly queued.
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 user-defined function is not marked as a queue function, so it processes each Item context individually and resets the accumulator for every Item node.
A user-defined function that accumulates a value across multiple source contexts must be set as a queue function in the message mapping. Otherwise, the mapping runtime invokes it once per context, resetting the accumulator and producing an incorrect sum such as 0. Marking the function as a queue function ensures it is invoked once and can iterate over all Item nodes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The user-defined function is not marked as a queue function, so it processes each Item context individually and resets the accumulator for every Item node.
Why this is correct
In SAP Cloud Integration message mapping, a user-defined function that accumulates values across multiple occurrences of the same source node must be declared as a queue function. Without queue processing, the function is invoked per context, resetting the accumulator for each Item node, so the returned sum is 0 or only the last value, depending on implementation.
- ✗
The user-defined function must be written as a Groovy script in the Script step instead of a message mapping function, because mapping functions cannot aggregate values.
Why it's wrong here
Message mapping user-defined functions can aggregate values when configured correctly, so moving logic to a Groovy script is unnecessary. While Groovy scripts can also aggregate, the scenario describes a mapping function already in place. The failure is due to the function's execution context, not an inherent limitation of mapping functions.
- ✗
The mapping runtime does not support user-defined functions that perform arithmetic on numeric values, so the subtotal element is left empty.
Why it's wrong here
SAP Cloud Integration message mapping fully supports user-defined functions that perform arithmetic, including summation of numeric values. Claiming that arithmetic is unsupported is incorrect; the issue is not the operation itself but how the function is invoked across multiple contexts. The developer can implement summation correctly with the appropriate queue function setting.
- ✗
The Price element in the source is a string, so the mapping engine treats it as text and cannot sum it, resulting in 0.
Why it's wrong here
Even if the Price element is a string, a user-defined function can parse it to a numeric type before summing. The mapping engine does not automatically convert or reject strings in this way. The reported behavior of always returning 0 points to context handling, not to a type mismatch that the function could not handle.
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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
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