But Acknowledgment is an internal table, so it may have several lines, so it's normal that there's an extra tag for every line (even if you have only one line). What you want is too specific. If you want to pass only one line as if it was a structure, then I don't see an other solution than changing the parameter type of the function module to a structure instead of an internal table (and change the code accordingly), and regenerate the service definition.
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