You probably have to refresh the fields, in the source. When the integration is first opened, and there are no other windows open, double-click the source's name top open its properties. Next, click the Columns tab, and then click Refresh Columns. Click OK, then go back to your destination mapping to see whether the field is present. You can also right-click the source's name and select "Preview" to see if the new field is shown.
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