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I hope you have a positive answer for the following (I think typical) scenario:
Input Table -> tMap -> Output Table - you have done your mapping and possibly added a few expressions.
Then you come to the conclusion you better use e.g. a tReplace before tMap (for whatever reason...is just a scenario). How to squeeze it between the Input and tMap without removing the connection between Input & tMap and thus most of the settings in tMap? I mean that Talend does automatically puts tReplace in between and updates what is required in order to keep my mapping in tMap.