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Add a new String literal directly into a functoid e.g. concat, switch to design view and back to mapper and it appears as an external literal rather than "in-line". The BPEL source generated for external literals or text input inside functoids is the same. I recommend that it is better to change external literals to show text inside functoid where possible since it uses less screen real estate.
If we implement this scenario it will make incosistent others: user drops literal on diagram, switch to design and back to mapper. Instead of literal the text will be inserted into another functoid. Because we can't distinguish 2 these cases in BPEL source.