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Tested using GlassFishESB v2.1 nightly build (20090515-1455). When Minus operator is used in a process, it can be configured from the Properties panel. However, the "subtract from" field accepts invalid characters and invalid entries. In addition only operator ids are valid entries. Shouldn't names be used since ids are only visible if the operator properties are viewed? Steps to reproduce: (1) Create IEP process with at least 2 relations fed into Minus operator (2) View Properties panel - Ctrl+Shift+7 (3) In "subtract from" field enter an invalid name (e.g. use &*!), which is "saved" and displayed in the Properties panel (4) Double-click the Minus operator to view the Property Editor; invalid entry will not be displayed. If valid selection is made, then the Properties will be updated. Note that operator id (e.g. o2, o3) is used and not the operator name. "relation inputs" uses operator names, so why is not consistently used in "subtract from" as well. Also, the Property Editor uses operator name and not id in "Subtract From" drop-down list.