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The root problem is the Excel's macro API behavior. If a different separator is used, other projects will have issues with the data as the separators are locale-specific. We plan to investigate if Excel allows us to use the incoming data in the list of restricted values differently. Note please that this might not be possible to change, given the limited technical support from MS Excel for the restricted lists (this is a programmatically generated restricted list, not user-defined). And please be also aware that also Excel Client is only in a maintenance mode, given the ceasing support of Microsoft for VBA external libraries, we expect this will go further in the upcoming years.